Remember, slavery itself was normal only 60 years earlier (and was abolished via a civil war, not a popular vote). This massacre, which had the support of many

Remember, slavery itself was normal only 60 years earlier (and was abolished via a civil war, not a popular vote). This massacre, which had the support of many citizens, some businesses, and some government, is still in living memory - there are thousands of Americans alive today who were ~5-13 years old at the time. Ideas take much longer to die than people do. Considering all this, it seems clear that the long tail of evil and hatred in the US will linger for at least many decades more, maybe centuries, but hopefully shrinking the whole way.