First of all, you need to learn your OWN language before trying to make an 'adult' decision.
Here, let me be your teacher for a moment. "Imagrents is IMMIGRANTS", "country's is COUNTRIES without the apostrophe", "dangerious is DANGEROUS. I think you meant dangers". Also, "their is THERE and vacancys is VACANCIES".
Now that we have all that cleared up, would you like to think about this country? In reality, we Americans DEPEND on immigrants from around the world to build our schools, pick our food, or even to build the roads for your lazy butt to drive on. Without them, how would you think this country would hold up? Immigrants built this country and technically we are ALL immigrants.
Think about it.