If you are in Canada, even if you are just visiting there from the United States, you can't get any Advanced Placement (AP) courses to come up when you are editing your courses. If you already had an AP course among your courses when you went into edit, it will be gone when you come back from it. If you are using the Android or iOS app, you can still drill down within the high-level subject area, such as Math or Science, to get to the desired course. I don't know the equivalent path on the web site, but perhaps someone else can fill us in on this.
The one exception is AP Computer Science Principles. (I don't know if inclusion of this was an oversight or intentional.)
I wondered if this was because the AP exams are not offered in Canada, but the very first sentence of this Wikipedia article states that they are:
But I'm guessing that AP U.S. History and AP U.S. Government & Politics are not offered in Canada.