Final answer:
The Convention of 1818 set the American-Canadian border at the 49th parallel and established joint occupation of the Oregon Territory. It did not involve the cession of Florida from Spain nor the Louisiana Purchase from France.
Step-by-step explanation:
The Convention of 1818 addressed several issues between the United States and Great Britain following the War of 1812. The agreement helped to establish a more harmonious relationship with regard to trade and borders. Notably, two true statements regarding this convention are that it established the American-Canadian border at the 49th parallel, and that America and Great Britain agreed to joint occupation of the Oregon Territory. It is important to note that this convention did not involve Spain ceding Florida nor France selling the Louisiana Territory to the United States; these were settled in separate agreements, with Spain ceding Florida to the United States in the Adams-OnĂs Treaty of 1819, and the Louisiana Purchase occurring in 1803 where France sold land to the U.S.