This article reports a study which shows that Americans aren't very interested in U.S. politics and even less interested in the politics of other countries. Well...duh! Current U.S. politics aren't very interesting; a bunch of second-raters yelling "yo momma" at each other in tinny little voices.
Politics overseas can be more interesting but for residents of the world's sole superpower, perhaps not very relevant to everyday life. It takes something like 9/11 to interest most Americans in the political concerns of folks overseas. Without a recurrence, that interest doesn't persist. And why should it? If you don't personally travel overseas and trade overseas, what happens there doesn't seem much relevant to daily life here.