Honestly, I know Americans pride themselves in being a big diverse country, but you use that excuse way too often to do nothing and you also underestimate other countries (and by extension yourselves).

Germany is not homogenous, we were a split country for several decades. The economic impact of that can still be felt and seen today. The east is significantly poorer than the west, has different cultural influences from Soviet times and generally also votes entirely different from the Western part of Germany. You can still see the Iron curtain in pretty much all German statistics. Not to mention the differences between the North and South (e.g. pretty much everyone clowns the Bavarians, they’re way more conservative and self-centered than the rest of us). It still works, because we don‘t let that stop us. You‘d do well to do the same instead of giving up instantly every single time.