Question

why does each state get one vote in congrss

Answer 1

The Great Compromise (sometimes called the Connecticut Compromise) in the Constitutional Convention stated the House of Representatives would represent the people as apportioned by population; the Senate would represent the states apportioned equally - See more at: http://www.chacha.com/question/why-did-the-articles-of-confederation-give-each-state-only-one-vote#sthash.DoB7Vfsf.dpuf

Answer 2

Because each state has to be equal in votes of congress