No it wasn't, much work was done in the Netherlands by researchers there and the original prototypes were made in the Netherlands and shipped as demos to the US! The idea that it was solely developed in the US is a MAGA fever-dream of American exceptionalism. The US only did very early research but never actually built anything based on the research, the Netherlands and ASML built on the early research, did more research on top of it, and then actually made it work.

ASML also created the deals with Zeiss and other European companies which were critical in getting all the necessary components created to make EUV happen. None of this would have happened with Jos Benschop and Fred Bijkerk (in the Netherlands).

I agree that some research was done in Japan, Russia, and the US, but this is the case for basically every technology, it's never the case that only one country is responsible solely for something. I'm pointing out (correctly), that ASML kicked ass with EUV tech in a way that no other company did, including Intel, which shows they have something that no other company has. Again, if it was so easy, why isn't an American company making those machines which are critical for the entire worlds security and productivity?