There is a lot I disagree with in the opening post, but I want to comment on only one allegation: that immigrants have diseases. When Eastern European Jews started arriving in the US in large numbers, at the end of the 19th Century, one of the leading arguments against them (and other immigrants from Eastern and Southern Europe) among the anti-immigrant native Americans (a term which at that time referred to white Americans descended from English and Scots-Irish immigrants) was that they were riddled with disease. They were not. And a small number of them and their descendants went on to become leading researchers and Nobel laureates for their work fighting the diseases they did not have.
So learn a little history and get a better grip on your facts.