@INVAR You said. "We either INSIST everyone here become Americans, speak English and adopt our values with virulent prejudice against those ideas and cultures actually hostile to our foundations - or we will be buried by those who are willing to impose their own values and prejudices upon the rest of us."
I was born in this country in 1933. Most people went to church on Sunday and it was held to be a holy day - no stores were open. No one locked their houses or locked their cars and most left their car keys in the ignition when they went shopping.
Almost every person spoke English. One did not hear foreign languages being spoken anywhere they went.
When I was about 19, I was on the road to Tyler, Texas, and a tire went flat. I had no cell phone and did not lock myself in my car; that would not have occurred to me to do that. Two black men stopped and changed my tire. I thanked them for doing that.
I think, INVAR, white Americans will be in the minority due to whites not having many children and Spanish and Arabs are having many. At some point, the official English language of the government will change to Spanish. This is my observation after being here 83 years and watching the changes.