One of the reasons I advise students to go to college in another part of the country is because lacking things like the draft, we as Americans don’t know each other. It is too easy to make a mental meme of people we encounter only through media.
There have always been mass migrations and periods of adjustment. Retreating into our bubbles extends the integration process.
The rural midwestern farmer sees diversity all the time. Who do you think is bringing the crops in? Who is manning the canneries? Who is processing your Thanksgiving turkey? That town that I mentioned above has industries that would collapse without the new immigrants.