Haven't seen straight-up alterations of history much - but still a high volume of leftist opinions presented as either some bogus "consensus" or even as facts ('Cratsplaining) inserted here and there, over and over again. Subtle but biased heavily. 

Cue: DJT:(with calm frankness, shaking head ruefully) Wikipedia is VERY DISHONEST in many things!! In the way it portrays conservatives and Republicans, especially!! Shameful!!