You do realize that the biggest economic growths in the last 100 years were during FDR, JFK, and Clinton, while the biggest economic declines were during W, Reagan, and Nixon right? Three of the presidents I mentioned were tax and spend liberals, three of them were trickle down economics and big military. Lets see if we can match then up.
I just wanted to add that this does not prove capitalism fails, it proves capitalism thrives. Capitalism isn't about spending money you don't have, it's about gaining money from investors, using that money to help your corporation grow and rake in more profits for you and your investors, and repeating this process over and over again eventually building something big and strong.

Assuming you wanted to prove UM's ideas about capitalism wrong by responding to his input, I'd say you're wrongly correlating political ideals with economic systems.