"The U.S. recently briefly had a three party system with the emergence of the Tea Party. All it did was radicalize the GOP. Just ask John Boehner.
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In a multiparty system they probably would have been a separate minority party.
I think what the US is really suffering from is that the country is maturing. For a long time people could just claim new areas, start living there and create new lives. The country is now fully owned and populated so moving around to start anew from scratch is not that much of an option anymore. Basically the country is filling up with people. Europe had this going on for much longer and the US is going that way too.
In a multiparty system they probably would have been a separate minority party.
I think what the US is really suffering from is that the country is maturing. For a long time people could just claim new areas, start living there and create new lives. The country is now fully owned and populated so moving around to start anew from scratch is not that much of an option anymore. Basically the country is filling up with people. Europe had this going on for much longer and the US is going that way too.