The countries which avoid foreign affairs usually are socialist and isolationists.
Let see we got into the first world war because we gave weapons to the allies, we got into korea because NATO wanted to fight the spread of communism, we went into Vietnam and lost many lives in a war that was for country that didn't give if they got taken over by communists or not, we gave weapons to the mujahedeen and trained them into what become known as the Taliban and Al Queda which bombed us just because we crushed Iraq for taking oil from Kuwait and our involvement in Somali.
It's okay if we are just trading with other nations, but going around the world to die fighting someone elses problem is bullstuff.