The Texas park at the center of the border battle between Texas and Washington DC is named after a confederate general who refused to surrender and instead fled to Mexico.
When you think of "north" and "south" in terms of the Civil War, you probably think of "north" as being above "south" and "south" as being east of Texas.
It's not to erase history but to teach that just because something was okay in the past, it's not necessarily the right way of doing things or treating people.