It's not pure capitalism, of course. But America is undeniably more capitalistic than the majority of OECD countries and even goes so far as to consider capitalism an ideal, and capitalistic policies to be more virtuous. And the US is very much a low-tax country, in aggregate. See this graph: http://blogs.crikey.com.au/pollytics/files/2011/12/taxasgdp2...

From source: http://blogs.crikey.com.au/pollytics/2011/12/08/australian-e...