Not invalid. It's a label, for convenience. There is no membership list, except that created by magazines. Americans call the baseball championship the World Se

Not invalid. It's a label, for convenience. There is no membership list, except that created by magazines. Americans call the baseball championship the World Series, and people complain occasionally. People also complain that Americans call themselves Americans. People complain a lot. But I think it depends on your market. If you are selling a product or service that is relevant in the US, but you are not selling them in the US, you are ignoring a huge market and you would at least get an asterisk. More importantly, if you're a global business but not addressing the US market, you're leaving a huge hole for someone else to fill, and global corps spend a lot of energy trying not to do that.