I looked at probably two dozen American History and World History textbooks aimed at high school students, back when I was a high school student in ~2003, and none of them had more than a couple pages about US involvement in the Philippines, at the end of discussions of the Spanish–American war.<p>I think it’s safe to say that most Americans have little to no understanding of this history. Maybe “written out” is an exaggeration, but “quickly glossed over and afterward ignored” would be a fair summary.