The United States defended the institution of slavery for the first 80 years of its existence, long after it had been abolished elsewhere. The Confederation defended it for the first five years of its existence - which turned out to be the last five years of its existence as well. Who is to say what would have happened if it had succeeded in breaking away permanently?

If I was a Native American I don't think I'd see much difference between the two flags.

Ideally, as I said, I'd like to see both of them replaced by something fresh, along with the Union Jack. That can only happen when most people in a country feel that way, otherwise the banned symbol becomes a focus for all kinds of unpleasantness.