
The Louisiana Purchase was a seminal moment in the history of the United States, doubling its size and setting it on a course of Westward Expansion. The land involved in the 830,000-square-mile treaty eventually encompassed 15 states. In 1800, the territory came under French control after Napoleon reached an agreement with Spain. However, the purchase was not without opposition, and many questioned whether it was permitted under the Constitution.
| Characteristics | Values |
|---|---|
| Date of Louisiana Purchase | April 30, 1803 |
| Date of ratification | October 20, 1803 |
| Date of signing | October 31, 1803 |
| Size of territory | 530,000,000 acres or 827,000–830,000 square miles |
| Price | $15 million |
| Previous owner | Spain |
| Seller | France |
| Buyer | United States |
| US President | Thomas Jefferson |
| US negotiators | Robert Livingston, James Monroe |
| US Treasury Secretary | Albert Gallatin |
| French leader | Napoleon Bonaparte |
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What You'll Learn

The Louisiana Purchase was signed in 1803
Under the terms of the treaty, the United States acquired approximately 827,000 to 828,000 square miles of land west of the Mississippi River from France for $15 million. This acquisition effectively blocked Spain and France from North America and doubled the size of the United States, setting it on a course of westward expansion. The land encompassed by the purchase included all or parts of fifteen modern US states between the Mississippi River and the Rocky Mountains.
The Louisiana Purchase was not without domestic opposition and sparked debates about its constitutionality. Many questioned whether the US Constitution provided for such an act, as the ability to buy property from foreign governments was not among the powers listed for the President and the Executive Branch. President Thomas Jefferson, a strict constructionist, initially considered a constitutional amendment to justify the purchase. However, he ultimately decided to forgo the amendment due to public support for the purchase and its obvious value to the country's future growth.
The Federalists strongly opposed the purchase due to economic self-interest, the high cost involved, and their belief that France would not be able to maintain its hold on Louisiana. They also questioned the purchase's constitutionality and even tried to prove that the land belonged to Spain, not France. Despite the opposition, the Louisiana Purchase was a significant event that shaped the future of the United States and confirmed the doctrine of implied powers of the federal Constitution.
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The US purchased the land from France
The Louisiana Purchase, signed on April 30, 1803, was a seminal moment in the history of the United States. The US purchased the territory from France, which doubled the size of the nation. The land involved in the treaty was approximately 828,000 to 830,000 square miles and cost the US $15 million (around $340 million today). This purchase was made despite the fact that there was no provision in the Constitution empowering the government to acquire new territory.
The Louisiana territory had originally been owned by France, which surrendered its North American possessions, including Louisiana, at the end of the French and Indian War in 1763. Louisiana west of the Mississippi was transferred to Spain, while the territories to the east, including Canada, were ceded to Great Britain. In 1800, Spain returned the territory to France as part of Napoleon's Third Treaty of San Ildefonso. Napoleon had ambitions to restore France's colonial presence in North America and establish a French colonial empire.
The US had a vested interest in acquiring the territory due to its westward expansion and the critical importance of the Mississippi River and the port of New Orleans to American commerce. President Thomas Jefferson was aware of the potential military danger France posed if they controlled the Mississippi River. He sent James Monroe to join Robert Livingston in France to try to purchase New Orleans and West Florida for up to $10 million. If that failed, they were to attempt to create a military alliance with England. However, Napoleon's plans for Louisiana had been thwarted by a slave revolt in Haiti and the threat of war with England, and he needed funds. To the surprise of the American envoys, the French foreign minister offered them the entire territory of Louisiana for $15 million. Although this exceeded their instructions, Monroe and Livingston agreed to the deal.
The purchase was not without its critics, and there was debate about whether such a large property purchase was allowed under the Constitution. Jefferson himself had always advocated for a strict adherence to the Constitution, and he considered a constitutional amendment to justify the purchase. However, he ultimately decided to ignore the legalistic interpretation of the Constitution and ratify the treaty without an amendment, as he believed the purchase was necessary to protect the citizens of the United States.
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The purchase doubled the size of the US
The Louisiana Purchase, signed on April 30, 1803, and ratified on October 20, 1803, doubled the size of the United States. The US acquired approximately 827,000 to 830,000 square miles of land, encompassing 15 states, including Louisiana, Arkansas, Missouri, Iowa, Oklahoma, Kansas, Nebraska, North and South Dakota, and parts of Minnesota, New Mexico, Montana, Wyoming, and Colorado. The territory covered land west of the Mississippi River and was purchased from France for $15 million, which was a bargain at roughly 4 cents an acre.
The Louisiana Purchase was a significant moment in the history of the United States, not only because of its impact on the country's size but also because of the constitutional debates it sparked. President Thomas Jefferson, a strict constructionist, justified the purchase by arguing that it was necessary to protect the citizens of the United States and that it was a wise investment for the future of the republic. However, many questioned the constitutionality of the purchase, as the Constitution did not explicitly grant the President the power to acquire new territory. Jefferson considered seeking a constitutional amendment but was convinced otherwise by his cabinet, who argued that it was not necessary.
The purchase of the Louisiana Territory was also a strategic move by the United States to secure access to the Mississippi River and the port of New Orleans, which were critical for American commerce and transportation to the West. The territory had been under Spanish control since 1762 but was transferred back to France in 1800 under Napoleon, raising concerns in the United States about potential French control of the Mississippi River. James Monroe and Robert Livingston were sent to France to negotiate the purchase of New Orleans and West Florida for up to $10 million. However, they ended up agreeing to purchase the entire territory of Louisiana for $15 million.
The Louisiana Purchase faced opposition from Federalists, who argued that it was unconstitutional and that France might not have been the rightful owner of the territory. They also had economic concerns, as they feared that the new territory would provide Western farmers with an alternative route for their crops that bypassed New England ports. Additionally, the Federalists worried about the potential political implications of Western expansion, including the formation of new Republican states and the dilution of their political power. Despite these objections, the Senate approved the ratification of the treaty by a vote of 24 to 7, and the purchase was never legally challenged.
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The purchase was opposed by Federalists
The Louisiana Purchase was opposed by Federalists due to a combination of economic self-interest, concerns about constitutionality, and fears about the impact on the political landscape.
Firstly, Federalists were concerned about the economic cost of the purchase. Former Federalist congressman Fisher Ames criticised the deal, saying, "We are to give money of which we have too little for land of which we already have too much". The $15 million price tag, though considered a bargain, exceeded what the young nation could afford alone. Financing by European banks pushed the total cost to $27 million, increasing the national debt by 20%. Federalists also worried that the purchase would negatively affect the regional economy of New England. They feared that Western farmers would gain another outlet for their crops that bypassed New England ports. Additionally, Federalists were speculators in lands in upstate New York and New England, and the Louisiana Purchase threatened to divert potential buyers of those lands.
Secondly, Federalists questioned the constitutionality of the purchase. They argued that the President lacked explicit constitutional authority to acquire new territory. This position put them in an ironic situation, as they generally favoured a liberal interpretation of the Constitution and a powerful executive. However, in this case, they pointed out that the ability to buy property from foreign governments was not among the powers listed in the Constitution. Jefferson himself initially agreed with this interpretation, calling for a constitutional amendment to justify the purchase. However, he ultimately decided to ignore the legalistic interpretation of the Constitution due to public support for the purchase and its obvious value to the country's future growth.
Thirdly, Federalists were concerned about the potential impact of the purchase on the political balance of power. They worried that the acquisition of new territory would dilute their political power and lead to the formation of new Western states that would likely be Republican, further shifting the balance of power away from the Federalists. Additionally, some Federalists feared that the purchase would upset the balance between slave and free states, as it was unclear whether it was proper to grant citizenship to the French, Spanish, and free black people living in New Orleans under the terms of the treaty.
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The purchase was questioned on constitutional grounds
The Louisiana Purchase was indeed questioned on constitutional grounds. The purchase of the Louisiana territory from France in 1803 doubled the size of the United States, encompassing 530,000,000 acres of territory that would eventually become 15 states. The purchase was made by President Thomas Jefferson, who was a strict constructionist and had previously advocated for a strict adherence to the letter of the Constitution. However, the ability to buy property from foreign governments was not among the powers listed in the Constitution.
Jefferson initially considered a constitutional amendment to justify the purchase, but his cabinet, including Secretary of State James Madison, convinced him otherwise. They argued that the power to negotiate treaties was specifically granted to the president by the Constitution, and that the only way extending the country's territory by treaty could not be a presidential power would be if it were specifically excluded by the Constitution, which it was not.
Despite the popularity of the deal, there was vocal opposition from the minority Federalist Party, primarily based in the northeastern states. The Federalists opposed the purchase on economic self-interest, constitutional grounds, and Jefferson's perceived hypocrisy. They argued that the purchase was unconstitutional and that the United States did not have the right to incorporate the territory into the Union without the approval of all the states. They also questioned the value of the land and whether it was proper to grant citizenship to the French, Spanish, and free black people living in New Orleans.
Some Federalists even tried to prove that the land belonged to Spain, not France, but available records proved otherwise. In the end, the purchase was never questioned in court, and the Senate ratified the treaty by a vote of 24-7 on October 20, 1803.
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Frequently asked questions
France owned the Louisiana Purchase when the US Constitution was signed.
The Louisiana Purchase was a land deal between the United States and France, in which the US acquired approximately 827,000 square miles of land west of the Mississippi River for $15 million.
The Louisiana Purchase treaty was signed on April 30, 1803, and was ratified by the Senate on October 20, 1803.
The purchase doubled the size of the United States and provided a powerful impetus to westward expansion. It also confirmed the doctrine of implied powers of the federal Constitution.











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