Do you think that political correctness plays a major role in the falling of America?

Yes. You need to close your borders and make stricter immigration laws and penalties for breaking those laws. Just recently I read of an immigrant muslim couple who abused their child and bashed it to death in New Zealand. They are going to a NZ prison and once their prison sentence is finished they are going to be deported back to Africa. Maybe America needs to have a long probation period for people who immigrate there, and if during that probation period they commit a crime, then they have to be deported.