It's hard to tell what companies are American owned and which are foreign. Many companies don't make it easy to find out either. How Americans Can Buy American* does some of the work for us, but the site doesn't tell the whole story. For example, CompUSA is Mexican, but that's only half the story. In reality, CompUSA is being held buy a Mexican company (U.S. Commercial) probably so it can avoid paying some taxes. I wonder if this is making things cheaper for consumers. Whatever the consequences, it offers some insight into who owns what.
*Since American products are everywhere in the world, the site/book could be renamed How Everybody Can Buy American.