What lies north of the territory ceded to the united states in the convention of 1818?

Simply put, the answer is Canada. Two nations, the United Kingdom and the United States, agreed to a boundary line along the 49th parallel north, which is what the boundary line between these two countries, the United States and Canada sit along.

A. democrat, republican, whig, other.(the democratic and republican parties are the main 2 american political parties, the whig party was popular among the early presidents, and the “other” option allows for outliers)