American ethnicity has been affected by all cultures and customs that emigrated here.
The dominant white Protestant evangelical social conservative culture no longer serves the needs of the vast numbers of Americans.
Yes, multiculturalism will continue and America will continue to improve by it.
1. How does America improve by somebody who can't communicate in the national language ?
2. How does it help to have cab drivers who won't pick up blind people with a dog, or someone with an alcoholic beverage bottle, because it's against their culture ?
3. How does it improve America to have a university spend thousands of dollars on some idiotic footwashing basins ? (when students' tuition is going up)
4. How does it help to have a crowd of Muslim ass-lifters praying in the street blocking traffic, or disrupting an airplane flight, and delaying it so they they can wail their sickening-sounding prayers ?
5. How does it help America when Americans are fired from their jobs for bringing typical American culture foods to work (which contain pork products) ?
6. How does it help America to have Muslim loons beating their wives, and claiming it's OK because their guidebook (the Koran) tells them so ? (Koran 4:34)
7. How does it help American to have loons owning slaves, and claiming it's OK because their guidebook (the Koran) tells them so ? (Koran 33:50, 23:5-6, 4:24, et al)
8. How does it help American to have loons owning molesting kids, and claiming it's OK because their guidebook (the Koran) tells them so ? (Koran 65:4)
9. How does it help American to have loons killing innocent animals, and claiming it's OK because their guidebook (the Koran) tells them so ? (Eid al Adha)
10. How does it help America when a looney Muslim husband blocks a hospital emergency room door to stop an emergency caesarian section surgery for his wife because no female anesthetist was available ?
11. How does it help America to have schoolgirls die in a fire because some cultural nutjobs interfere with rescuers, because they didn't like it that the girls didn't have their head scarves and abayas on ?
12. How does it help America when a sub-culture coerces artists to change their art, to conform to the demands of the (lunatic) sub-culture (like Muslims did to Paramount Pictures regarding the movie
"Sum of All Fears"
Here's the dirty dozen. (by no means a complete list)