Real beer has color. Miller, Bud, Becks, Grolsh, Corona, Fosters etc etc. are just a bunch of fru-fru lagers. America makes great beers, you just won't find them in the domestics section.
http://www.redhook.com/
http://www.deschutesbrewery.com/
http://www.pyramidbrew.com/home.php
http://www.bigskybrew.com/
not to mention all the breweries mentioned by nogoodreason as well as countless others.
By the Way, Sam Adams sucks donkey dick