While in Africa, the Mozambicans would often us where we were from. I always responded I live in America. They would continue to ask, "no but where is it you are from?" and every time I replied "America" they would become more frustrated. I asked our host why this was upsetting to them. I thought it was because they couldn't speak english very well. You have no idea how many people would say "Hi, how are you?" and when I responded "good, how are you?" They would repeat "Hi, how are you?" (they didn't know what it meant, just that it was an english greeting)
The host explained that to them America, is the Americas, as in North and South, not the USA. They only know it as the United States (other cultures can make you realize just how little you really know). Anyway, however you call it, America, the US, USA or home, Happy Independence Day!