For example, If southern Ontario were a state then it would be the 6th most populous state [2] [3] (between Illinois and Pennsylvania in population) and also more dense than Illinois.
I feel like Americans don't really appreciate how most Canadian cities are so close to the border.
[1]https://en.wikipedia.org/wiki/Quebec_City%E2%80%93Windsor_Co...
[2] https://en.wikipedia.org/wiki/List_of_U.S._states_and_territ...