U.S. law requires that imported products have the "country of origin" marked on the product. When the product is made in the USA, that identification is usually large, and attached in a permanent manner. Many products made in communist China use tiny adhesive stickers, using adhesive that tends to "accidently" cause the label to fall off. So, if you see a bike or bike frame and don't find ANY clue as to the nation of origin, a good bet is that your are looking at a communist made product.
Bike related products made in Japan currently tend to be both rare and expensive in the USA. Rivendell buys frames from a small, family operated shop in Japan, as well as stems and bars from the Nitto company in Japan. High quality. High prices.