Anisa is Canadian, not American, but the whole "I'm IRISH American" shit when you really have a 4th great-grandpa you have barely any genetic connection to and zero cultural connection to comes from a perceived lack of American identity. In a nation like Germany or Japan you have thousands of years of shared culture, tradition, languages and leaders. Germany is overwhemingly ethnically German, there is a shared link between people. America is a new nation made up of people from everywhere in the world. It's harder to point to one specific shared cultural identity. To make up for this lack of a singular national identity people cling onto a plasticy basic understanding of the culture of their distant ancestors they never met who come from homogenous nations.
Or Anisa is just a boring E-Skank who thinks it makes her more interesting either way.