While civil war is overly dramatic, there is a looming conflict.
The worker to retiree ratio is currently about 3 to 1. As the boomers retire, it will drop to 2 to 1.
No doubt the young will resent the high taxes and some will blame the old people for it.
While the young AMERICANS will grumble, at least they'll know the taxes are going to support their own parents and will probably understand paying high taxes is better than having Mom & Pop in their guest room. The young IMMIGRANTS, on the other hand, won't be so understanding. Since they'll be sending money home to their own families, they won't like paying to support old gringos, too.
I hope "Second Civil War" is overly dramatic, but the fact is that America typically undergoes a major crisis every 4th generation. We are due for a major upheaval soon.