I generally buy what I like (usually I look for value- the best combination of price and quality), but if it is US or Israeli made it is a bonus. This is true of guns and everything else.
Clothing- it is nearly impossible to find "made in the USA" anymore (though I do plan to have a suit custom made as a reward after I lose around 80lbs).
Cars- I've owned a couple American cars in the past (Ford, Oldsmobile), but mostly Japanese (2 Sentras, 2 Tercels), one S. Korean (2004 Sonata) and currently one from Germany (2003 BMW 325i). Though, with the exception of one Sentra and the Sonata, the rest of the foreign made cars were bought used (partially intentional, though with 2 foreign made cars bought new, obviously I consider them when buying new).
Furniture- Mostly made in the USA
Electronics- Do we even make any here anymore?
Guns-
Benelli shotgun, made in Italy. However, I liked my US made Mossberg I used to have more than the Benelli so it probably will be traded on a US made Mossberg soon.
Hanguns- Brazil (2), Argentina (1, but the Bersa is about to go), Czech Republic (currently 1, 1 sold a few years ago), Italy (2 BP replicas), Germany (love my SIGs, 2), Philippines (1), and the US (several)
Rifles- 1 mil-surp (Romanian SKS), but otherwise I think all I own and all I have owned but sold are made in the USA (this will eventually change with a Howa or CZ bolt rifle I will probably buy in the next year).