If intolerant immigrants become a majority in a tolerant country, how does it stay tolerant?

Hate to break it to you but America has no definitive culture. People have been immigrating to America since before its birth along with their language and culture. It is America's diversity that makes it what it is today.

By the way there is no good without evil. Get rid of the evil and we all live a monotonic controlled life.

By what criteria can you judge a society? There are intolerant people in every society. You can't generalize and say that this society is "intolerant" and this one isn't. As you said, there are Christian fundamentalists, and they are dealt with in an appropriate manner just like any other fundamentalists. But you need to judge each individual based on what they do, not based on what other people in their "group" do.

i might tolerate people who carry distinctive evaluations than me, except they have been particularly disgusting or if the guy acted out badly. working example, i does not tolerate a guy who believes he has a real to conquer or rape a female, even with the indisputable fact that i might tolerate a guy who thinks women could be housewives. that's superb to kill those with kindness. If I act like a rational known individual, the different could take my evaluations greater heavily. people who rant and rave at every person who seems illiberal will basically look like as undesirable a loony because of the fact the guy they do in contrast to.

by selecting politicians in the White house