frederick trump first immigrated to the USA in 1885, then to Canada in 1989, and then self deported in 1901. He did not stay in America long enough to get citizenship, so we have to look at the second time he immigrated to the USA.
In 1905, trump and his pregnant wife immigrated to the USA. They lied about their country of origin, their name, and trump's previous stay in the USA. These lies made them illegal immigrants. fred trump was born to an illegal immigrant couple who had entered the USA illegally.
trump continued the lie, claiming to be from Sweden, even though he knew his grandmother spoke German, not Swedish.