What triggered Thomas Jefferson's decision to make the Louisiana Purchase?

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Spain, which controlled the port of New Orleans, closed it to American commerce in 1802. This threatened the commerce of farmers and merchants in the western United States who depended on the Mississippi River and New Orleans to transport their goods to market. Jefferson feared that without access to the Mississippi and New Orleans, the western states would become economically dependent on Great Britain or on a foreign power. Therefore, he decided to purchase Louisiana from France, which would give the US control of the Mississippi River and access to New Orleans.

What Triggered Thomas Jefferson's Decision to Make the Louisiana Purchase