Incorrect. The U.S. was created by British settlers. The “operating system” of the country—everything from the legal system to the prevailing norms at elite institutions—remains Anglo-American, and has virtually nothing from any other culture.
Immigration has provided cheap labor, but at the cost of degrading our social and political systems. Irish and Italian immigration, for example, destroyed the founders’ vision of self governance and replaced it with political machines that mobile masses of low information immigrants to legitimize top-down authoritarian systems.