Ix In the War of 1812, the United States A fought Mexico for territory in the Southwest. B gained the Florida territory from the Spanish. C fought France for control of the Louisiana Territory. D responded to England's attempts to restrict US trade in Europe.

## Step 1<br />The War of 1812 was a conflict between the United States and Great Britain, which took place from 1812 to 1815. The war was triggered by several issues, including trade restrictions set in place by Britain due to the ongoing Napoleonic Wars, impressment of American sailors into the British navy, and American desires to expand territory.<br /><br />## Step 2<br />Option A is incorrect because Mexico was not involved in the War of 1812. The conflict was between the United States and Great Britain.<br /><br />## Step 3<br />Option B is also incorrect. The Florida territory was acquired by the United States from Spain in 1819, through the Adams-Onís Treaty, which is after the War of 1812.<br /><br />## Step 4<br />Option C is incorrect because the Louisiana Territory was acquired by the United States from France in 1803 through the Louisiana Purchase, which is before the War of 1812.<br /><br />## Step 5<br />Option D is correct because it accurately describes one of the main causes of the War of 1812. The United States responded to England's attempts to restrict US trade in Europe.