The USA deserves credit for putting together a set of minds and people. The "people" in this regard is international. Two of the biggest player in rocket science is Wernher von Braun and Qian Xuesen. This sum up beautifully, "The American journal Aviation Week & Space Technology would name Qian its Person of the Year in 2007, and comment on his interrogation of von Braun, "No one then knew that the father of the future U.S. space program was being quizzed by the father of the future Chinese space program."
USA was founded as a nation of European immigrants - so they should be considered American. The Chinese, Jamaicans, etc are largely insignificant in American scientific achievement compared to the ones from Europe. .. Yeah they can be considered international.