Who Decided the Great Political Party Divide?

One 2016 POTUS hopeful said he is a Democratic-Socialist. No way! There's no such thing. In America there are only two parties. Republican and Democrat. Those are the rules! Aren't they?  (O.o)

Difference on Social Issues Equal Political Party Divisions. True or False.

Who Decided the Great Political Party Divide?

Most Western democratic nations have multi-party systems. But the United States is as close to a two-party system as any democracy has come. A look at presidential elections from 1896 to 1968 shows

http://hubpages.com/politics/Who-Decided-the-Great-Political-Party-Divide