Plenty of other places are covered in the 'New Imperialism' section. I like that section since I get to talk about places all over the world. One of the things I like to introduce kids to is art and culture from other places that they will never otherwise get introduced to. The industrial Revolution unit sucks by the way.
I like the current sequence for the US history classes but that may be mostly since I familiar with the sequence going back all the way to college. The idea of U.S. 1 I guess being the country working out its identity settled, settled enough, by the Civil War. US history two is then "America as you know it beginning to form". US 3 starting at end of the Cold War sounds good. But until colleges start doing US 3 classes I don't think there will be a push to get it in the high schools.
Did you take AP classes?