That’s really hard to source honestly due to the nature of proxy wars. The list I provided does include large conflicts in which the US was a beligerent in some way, shape, or form, so not just wars. For example, it includes domestic conflicts the US never flagged as wars such as the various campaigns against the American natives, the invasion of Mexico and a whole bunch of others lesser known ones.
Yeah, I suppose Rammstein were actually a bit optimistic with that line.