The Act Prohibiting the Importation of Slaves was signed in 1807 and became effective in 1808. To reduce the international slave trade, this law prohibited the importation of new enslaved people into the US.

The US acquired Florida from Spain through the Adams-Onís Treaty, which was signed in 1819 and became effective in 1821.

The Arikara War (1823) took place between the US and the Arikara Indigenous group in present-day South Dakota in the Missouri River area. The latter was the first armed conflict between the Indigenous peoples of the Great Plains and the US. The Arikara are referred to as “Ricaree” in the document.