Is it true that pretty much everyone in America can trace their lineage to Northern Iran & Southern Russia?

and before that, we all came from africa, the place where humans originated from

Broadly speaking, what she says is true. The Hindu vedic texts refer to these people as "Aryans" and the name "Iran" is cognate with "Aryan". Due largely to the latter's 20th-Century association with Nazism & Racism, the term Indo-European is used, which is probably more objective as well. As for Daviswylde's answer, I will simply quote the SecDef in Independence day. "Uh... Mr. President. That's not entirely accurate..." Recent discoveries in genetics have proven- definitively- that 4% of the human genome comes from outside of Africa. At least 1% from neanderthals and 3% through either neaderthals or the Eurasian homo eructus. These genes are NOT present in ANY indigenous African population, but present in ALL Human populations indigenous to regions other than Africa. OOA has thus been partially falsified, though the lion's share of genetic diversity (up to & likely near 96%) of modern humans arose in Africa.

This is interesting because a group of Bulgarian Scientists have recently gone to Iran to trace the bulgarian ancestry to their country : Link to Article: http://caspiankids.webs.com/apps/blog/show/4039101-things-you-should-know-bulgarians-travel-to-iran-to-find-roots

before this crap of scientific jokes search "persian" in Google-images. we are clearly similar to Europeans. in fact, "Iranian" is a concept that covers many tribes and nations: Kord, Lor, Fars, Tajik, Turk,Pashtoon, Hazare and .... . in the Modern era this aparted countries rised and concept of "nation" with its western taste alters this concept of "Iranian".