Rewriting history sure, but not removing/hiding history. I'm not sure as to what Corderlain and Master Matthew were talking about, liberals love talking about America's tribal past.
For those interested in what people mean by liberals rewriting history to support their bias, check out what the College Board did with the AP United States History curriculum in 2014 and 2015. They rewrote it to revolve around struggles for peoples' rights and acceptance, there was a big conservative backlash, they ignored conservative complaints, then people threatened to use a competing business and they decided to re-revise their curriculum.
Coming from a background of public education in California, I can confirm that history and just about everything is presented from a liberal viewpoint, with teachers offering little compromise on their presentation of the material. I still remember when my APUSH teacher told the class that Fox News and MSNBC were conservative and liberal networks, while CNN was a neutral network that showed stories without any real bias. Good stuff.