Define 'ultranationalists' if you will?
People so driven by a sense of nationalism that they will tolerate anything to preserve their "heritage".
Thats the best I can do.
Nationalism is a good thing, but in the wrong hands or taken too far, it spells doom for a nation. The Germans and the Japanese learned that lesson the hard way, and it cost the world millions of deaths. My father spent six months in a German POW camp watching it, and his own German mother refused to believe what he told her.
I am proud to be an American, and I welcome immigrants that are willing to become Americans. They have to learn english to prove to me they are serious.
A lot of people underestimate the power of our country and the effect on the people that come here. Who wants to be a Mexican (or anything else) when you could be an American?
Punishing people for chasing a dream is hard for me to do.