Seems like an extremely reductive and negative take on what is "American". Perhaps you've only experienced America via LinkedIn and a specific shitty company?
I thought it was strange that I hadn't heard of this...apparently it's widely agreed that it's a conspiracy theory started by Russia and then amplified by China.
Yes, we regularly (for some definition of "regularly") uncover human burial sites (both as part of planned archaeological excavations and accidentally during construction) all around the world, including Europe, Asia, and the Americas. If you're asking specifically about tombs then the answer is also yes.