Well chances are about 50/50 you are buying American there. Most of Nissan's cars for the US market are made in the US because even with nominally Japanese ownership, they are a company that lives and dies with the North American market. They have little share in Japan, the bosses are mostly foreigners from every part of the world, and every bit of business worldwide is done in English; even the Japanese bosses must speak English 100% of the time.
Welcome to the 21st century, most of the big companies in the world will be just like this soon enough. GM included.