Why the US has a Two Party System
Channel: Richard Wagner
Date: 2013-07-18

This is called "Duverger's Law". 

This is more of a "How" than a "Why", actually.

Professor Wag explains why in the US, where all citizens over 18 (with few exceptions) have the right to vote, and over 1/3 of the population is going independent, still has a rigid two party system.  It's not because the voters like it.

Don't worry about the thumbnail...this isn't going to be "chalk and talk".  I have these written on the board ahead of time and will simply be pointing to them.

This video discusses "runoff" elections as an alternative, but if you would like to learn about "Proportional Representation", follow this link:
http://ivn.us/2014/08/05/an-independent-analysis-of-proportional-representation/