What Useful Contributions Have Liberals Made to America?

I honestly think this should be a tough one for most conservatives to list. I really have trouble coming up with any myself. I think it would probably make more sense to talk about how liberals have destroyed American society instead but that one is far to easy.

I would love to hear what you have to say about this. Leave your comments and lets kick off the debate.

What Useful Contributions Have Liberals Made to America?

If Any.....

-PVP