Before WWII as well. And after. I can remember words like Jap and Chink being regularly used. It's only the last 20-25 years that any real integration has occured. We don't discriminate much against Irish anymore either.
Blacks are a special situation, due to the extreme levels of
predjudice which has worked against them for so long.
Hispanics are the new kids, and are being treated poorly right
now.