Even 20th century events are heavily glossed over. There's this one Lithuanian poster on Liveleak called "Crapcakes" that said the Lithuanian language was heavily edited by the CIA to fit that of English, and that most of Lithuania's population was replaced with Turkic and Caucasian (as in, Georgian, Iranian, Armenian) immigrants during the Soviet period, which is why Lithuanian names and surnames are now so rare there. He's probably telling the truth as well.
Also, there was apparently an MKUltra program in Europe that's completely glossed over and "forgotten", not even documented like the American one.