
The Louisiana Purchase of 1803, which doubled the size of the United States, was a highly contested issue in terms of its constitutionality. The purchase of 830,000 square miles of land from France for $15 million was promoted by President Thomas Jefferson, but many questioned whether he had the constitutional authority to make the deal. While the purchase was popular, particularly in the West, Jefferson's political opponents, the Federalists, argued that the ability to buy property from foreign governments was not among the powers listed in the Constitution. This debate centred on the interpretation of the Constitution, with Jefferson himself taking a strict, literal view of constitutional powers. Despite the controversy, the Senate ratified the treaty on October 20, 1803, and it was never questioned in court.
| Characteristics | Values |
|---|---|
| Date of the Louisiana Purchase | October 20, 1803 |
| Size of the territory | 830,000 square miles or 530,000,000 acres |
| Number of modern US states encompassed | 15 |
| Purchase price | $15 million |
| Number of senators who opposed the deal | 7 |
| Political affiliation of opposing senators | Federalist |
| Reasoning of opposing senators | Lack of specific constitutional authorization, potential alienation of affections for the Union, and economic self-interest |
| Jefferson's view on constitutional powers | Strict and literal, requiring specific powers to be spelled out in the Constitution |
| Jefferson's actions | Considered a constitutional amendment, but ultimately ignored legalistic interpretation to expedite the purchase |
| Madison's view | Within even the strictest interpretation of the Constitution due to the president's power to negotiate treaties |
| Albert Gallatin's view | Extending territory by treaty is a presidential power unless specifically excluded by the Constitution |
| Federalist argument | The purchase was an "unconscionable bargain" aiding France in its designs against Great Britain |
| Federalist hypocrisy | Previously advocated spending up to $5 million to send troops to take New Orleans by force |
| Constitutional significance | Set a precedent for westward expansion and shifted the balance of power |
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What You'll Learn
- The Louisiana Purchase treaty was unconstitutional as it was an agreement with a foreign power
- Jefferson's Federalist rivals opposed the purchase, citing a lack of constitutional authorisation
- Jefferson's strict interpretation of the Constitution did not allow for the purchase of foreign property
- The purchase was a threat to the Union by upsetting the balance of power between North and South
- The purchase was criticised for granting citizenship to French, Spanish and free black people in New Orleans

The Louisiana Purchase treaty was unconstitutional as it was an agreement with a foreign power
The Louisiana Purchase treaty, which saw the United States acquire 530 million acres of territory from France, was considered by some to be unconstitutional. This was because the agreement was made with a foreign power, and the US Constitution did not explicitly grant the president the power to buy property from foreign governments.
Thomas Jefferson, who promoted the treaty, took a strict, literal view of constitutional powers. He believed that specific powers reserved for the President and Executive Branch needed to be spelled out in the Constitution, and that the ability to buy property from foreign governments was not among these powers. Jefferson's political opponents, the Federalists, were quick to point out this apparent contradiction.
However, others argued that the Louisiana Purchase was indeed constitutional. Article II, Section 2 of the Constitution grants the president the power to negotiate treaties, and some believed that this provided sufficient authority for the purchase. Treasury Secretary Albert Gallatin asserted that unless specifically excluded by the Constitution, the power to negotiate treaties and extend the country's territory through such agreements was within the president's remit.
The debate over the constitutionality of the Louisiana Purchase was never resolved in court. While some Federalists continued to view the purchase as unconstitutional, they did not pursue legal action. The purchase doubled the size of the United States and ensured the free flow of commerce along the Mississippi River, removing the threat of Napoleon Bonaparte's France.
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Jefferson's Federalist rivals opposed the purchase, citing a lack of constitutional authorisation
The Louisiana Purchase, a treaty with France, doubled the size of the United States and was popular with the majority of Americans. However, it was also a seminal moment for a new nation and raised questions about the constitutional validity of the purchase.
The opposition of the New England Federalists was primarily driven by economic self-interest, rather than a genuine concern for constitutionality. They did not want to see Western farmers gaining another outlet for their crops that bypassed New England ports. Many Federalists were also land speculators in upstate New York and New England, hoping to sell these lands to farmers, who might instead go west if the Louisiana Purchase went ahead. They feared the formation of Western states, which would likely be Republican and dilute the political power of the New England Federalists.
Some Federalists had previously advocated for the use of force to acquire New Orleans, and now they opposed acquiring the city peacefully, along with 530 million acres, for only three times the cost. They argued that paying $15 million for the land was an "unconscionable bargain", aiding France in its designs against Great Britain. They also questioned whether it was proper to grant citizenship to the French, Spanish, and free black people living in New Orleans, as the treaty would dictate.
While the purchase was never questioned in court, it represented a significant moment in the nation's history and highlighted the complexities of constitutional interpretation and the exercise of executive power.
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Jefferson's strict interpretation of the Constitution did not allow for the purchase of foreign property
Thomas Jefferson's strict interpretation of the US Constitution, which supported only the powers specifically granted by the document, did not allow for the purchase of foreign property. This interpretation, known as strict constructionism, held that the President could only exercise powers that were explicitly outlined in the Constitution.
Jefferson's interpretation of the Constitution was a matter of public record. In 1803, he wrote to John Dickinson, "The General Government has no powers but such as the Constitution gives it". In the same letter, he elaborated on the purchase of foreign territory, stating, "It has not given it power of holding foreign territory, and still less of incorporating it into the Union. An amendment of the Constitution seems necessary for this." Jefferson's strict constructionist view put him at odds with Federalists, who argued that the ability to buy property from foreign governments was not among the powers listed in the Constitution.
Jefferson's stance on the Constitution presented a challenge when he negotiated the Louisiana Purchase from France in 1803. This purchase doubled the size of the United States and was considered a seminal moment for the young nation. The acquisition of the 830,000-square-mile territory, which would eventually encompass 15 states, was not explicitly authorised by the Constitution. Jefferson, aware of this, initially drafted a constitutional amendment to specifically authorise the purchase. However, he was persuaded by his secretary of state, James Madison, to send the treaty to Congress without an amendment. Jefferson rationalised this decision, comparing it to a guardian investing money for their ward, saying, "I did this for your good."
While the Louisiana Purchase was popular, Jefferson's political opponents criticised the deal as unconstitutional. The Federalists, who had become a minority in Congress, objected to the purchase as it would further dilute their political power. Jefferson himself acknowledged the tension between his strict interpretation of the Constitution and his decision to move forward with the purchase. In a letter to John B. Colvin in 1810, he wrote about the duty of high-ranking officials to sometimes "assume authorities beyond the law" in certain circumstances, such as "saving our country when in danger".
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The purchase was a threat to the Union by upsetting the balance of power between North and South
The Louisiana Purchase, which took place in 1803, was a seminal moment for the United States as a new nation. The purchase of 530 million acres of territory doubled the nation's size and was wildly popular. However, it was also a highly controversial deal, with many questioning its constitutionality. The acquisition of Louisiana upset the balance of power between the North and the South, threatening the Union.
The treaty with France stated that the inhabitants of the ceded territory would become part of the Union and enjoy the rights of American citizens. This provision was highly contentious. Senator Uriah Tracy of Connecticut argued that the residents of Louisiana were unfit for republican government, and their admission would tilt the political power towards the slaveholding South. The North was concerned about Western farmers gaining a new outlet for their crops that bypassed New England ports. The Federalists, who were speculators in lands in upstate New York and New England, worried that farmers would now go west instead of buying their land. They also feared the formation of new Western states, which would likely be Republican, diluting the power of the Federalist North.
The Louisiana Purchase treaty set a precedent for the westward expansion of the United States. This shift in focus from the North to the West threatened to alienate the affections of settlers for the Union, as warned by Delaware Senator Samuel White. The purchase also raised questions about granting citizenship to the French, Spanish, and free black people of New Orleans, as dictated by the treaty. This further upset the balance of power and challenged the Union.
While President Thomas Jefferson understood the purchase to be unconstitutional, he chose to ignore the legalistic interpretation of the Constitution. Jefferson, a strict constructionist, believed that specific powers for the President and Executive Branch must be spelled out in the Constitution, and the ability to buy property from foreign governments was not among them. However, he was faced with a quandary as the purchase presented an opportunity to preserve the nation's peace, expand its reach, and enhance its prospects for success in self-government. Jefferson's decision to prioritise these benefits over strict adherence to the Constitution set a precedent and threatened to upset the balance of power between the North and the South, endangering the Union.
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The purchase was criticised for granting citizenship to French, Spanish and free black people in New Orleans
The Louisiana Purchase, which took place on October 20, 1803, was a seminal moment in the history of the United States. The purchase of the territory from France doubled the size of the nation and ensured the free flow of commerce along the Mississippi River. However, while the deal was popular, it also faced opposition, particularly from Federalists, who argued that it was unconstitutional. One of the main criticisms levelled against the purchase was that it granted citizenship to French, Spanish, and free black people in New Orleans.
The Federalists argued that the Constitution did not allow for the acquisition of new territory, and that Jefferson was exceeding his powers as President. They also had economic concerns, as they feared that the purchase would lead to the formation of Western states that would compete with New England economically and politically. However, some have argued that the opposition of the New England Federalists to the Louisiana Purchase was primarily motivated by economic self-interest rather than legitimate constitutional concerns.
The free black population in New Orleans had grown significantly during the Spanish period due to policies that encouraged the manumission of enslaved people. By the mid-nineteenth century, Louisiana had the largest number of free black people in the Deep South, and many of them resided in New Orleans, forming thriving and visible communities. The grant of citizenship to these individuals as part of the Louisiana Purchase was a point of contention for critics in Congress.
The debate over the constitutionality of the Louisiana Purchase was complex, and while some argued that it set a dangerous precedent for future presidents to ignore the restraints of the Constitution, others, like Supreme Court Chief Justice John Marshall, later asserted that the Constitution did indeed confer the power to acquire territory, either by conquest or by treaty. Ultimately, the purchase was never challenged in court, and the Senate voted for ratification, with supporters arguing that it was a necessary step to prevent a potential armed conflict with France and ensure the nation's peace and expansion.
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Frequently asked questions
The Louisiana Purchase treaty, which saw the US buy 530 million acres of North American territory from France for $15 million, was considered unconstitutional by some because the Constitution did not explicitly give the president the power to buy property from foreign governments.
Jefferson, who had always advocated for strict adherence to the Constitution, knew that the Louisiana Purchase was unconstitutional. However, he decided to ignore the legalistic interpretation of the Constitution because of the obvious value of Louisiana to the future growth of the United States.
Federalists opposed the Louisiana Purchase, arguing that neither the president nor Congress could incorporate new territory into the Union without the approval of all the states. They also objected to the idea of granting citizenship to the French, Spanish, and free black people living in New Orleans.

























