Having lived in Canada (32 years), Israel (2 months), Spain (4 months), France (1 year), and the US (7 years) I can definitely tell you that while female drama is pretty much universal, it is by FAR the worst in the USA. The differentiating reasons to me have been pretty easy to discern:
1) Hollywood's glorification of the likes of Paris Hilton that show young girls that being vapid, brain dead, and hot is all you really need to succeed in life. Then throw in shit like Real Housewives that basically say "look hot and marry rich" is what you need to do to succeed.
2) The conflict between normal sexual desires and North American culture that dictates if a chick sleeps around she's a slut. This causes all sorts of gossiping drama, backstabbing, and feelings of sexual guilt. Chicks in Montreal (French ones), France, and Spain will just openly state they want to fuck you, and doing so doesn't incur judgment from their friends/family. The girls in Israel weren't as forward as the other countries, but expected very little courtship and would cut right through all the BS if they liked you. P.S: Don't break up with an Israeli girl to her face unless you like getting your ass kicked. Seriously.
3) North American double standard feminism: Somehow in North America we've reached a point where women have emancipated themselves from stereotypical roles/functions (like cooking, cleaning, sewing, etc) while retaining the "beneficial" pre-feminism traditions such as "man paying, flowers, holding door open, letting women off/on elevator first, man takes out trash, man fixes shit around house, etc). This has created a whole generation of spoiled entitled chicks.
4) There seems to be a high preponderance for gender based child activities in the US. The thought of sending my hypothetical daughter to do cheerleading after school rather than say, swimming, is absolutely horrifying to me. However from what I can tell most mom's here would be giddy with pride that their daughter made the cheer team..
5) Probably the biggest doozy is there are a LOT more unstable, poor, broken families here than in countries that have socialized education and healthcare. Less broken families= less daddy issues = less drama
This is NOT to say that there aren't lots of perfectly normal chicks in the US, but what really differentiates them vs other countries is that in the US, the hotter the chick is the crazier she seems to be. Women here are just basically trained from a young age that if you're hot, that's all you need to thrive.