Explanation:
The War of 1812 was a conflict fought between the United States and its indigenous allies on one side, and the United Kingdom, its dependent colonies in North America, indigenous allies, and Spain on the other
I'm assuming because this is under the history thread, it's dealing with the U.S. Senate. There are two main political parties in the U.S. which are Democratic and Republican- but there is also an Independent party, just not as big. Representatives are people who represent a certain party in, I believe, the Senate. So when it says "proportional", it's most likely referring to the fact there is an equal amount of representatives who are under the two big parties- the Democratic or Republican.
This treaty gave the Japanese Manchuria which is part of modern day China and was formally known as Manchukuo.
