Why did James Monroe and Robert Livingston act quickly to buy the Louisiana Territory?

They felt that the purchase could stop a potential war between the US and France.

They knew that President Jefferson would disagree with the price and the amount of land.

They worried that President Jefferson did not have the authority to make the purchase.

They were afraid that Napoléon might change his mind and revoke the agreement.

The correct answer is They were afraid that Napoleon might change his mind and revoke the agreement.

The Louisiana Purchase (1803) was one of the most significant deals made in the 19th century. In this purchase, the United States would gain roughly 800,000 square miles for only $15 million. This equates to roughly 3 cents per acre, which was an incredible deal. This deal almost seemed to good to be true, however Napoleon was in need of money in order to pay off the costs of the Napoleonic Wars taking place in Europe. To ensure that Napoleon didn't change his mind, Monroe and Livingston went to finalize this deal as soon as possible.

They were afraid that Napoléon might change his mind and revoke the agreement.