Lots of blanks there with absolutely no clue what you're studying.
Since it says "unicameral," it's not referring the the US.
The _____ Plan, favored by _____ States, proposed giving States equal representation in a unicameral Congress.
2 answers
This doesn't look like an economics question to me.
http://en.wikipedia.org/wiki/History_of_the_United_States_House_of_Representatives
http://en.wikipedia.org/wiki/History_of_the_United_States_House_of_Representatives