Is there a direct link between immigration and rising unemployment levels?

im am from the USA so i can only speak of the cost to our economy ? but we have an estimated 8 million illegals, not to mention the legal immigrants ! the illegals take many jobs, but in truth they are jobs most americans wont work due to low pay,and hard labor. most americans probably wouldn't complain, however they get paid in cash and pay no taxes then send their money home . all the while getting free american health care,food programs, education for their children not to mention the numbers who are incarcerated here on american tax dollars !, and the recent big influx to america of indian IT engineers. my brother is an IT engineer, he used to earn 90,000 yearly . now he makes around 35,000 but he only gets a six month contract, which don't include benefits and the middle easterners open gas stations and food marts, and employ their own people for cash , who once again don't pay taxes ! to be fair a small percentage does get legal work and pay their taxes but its only the few, not the many and because there are so many immigrants willing to work for so little, americans are left to accept the same low pay or starve ! immigration used to be a good thing . the people would come,work a job pay their taxes ,learn english, and assimilate ! most recent immigrants hate americans, and bring their ideology with them i cant give a number, because homeland security keeps it secret. but i do know that a large number of terror cells are arrested every year AMERICA needs to say enough and put a moratorium on not accepting any new immigrants unless they come with a degree, a job, and a W-2 for paying their taxes the time is over when america and the EU could afford immigration ! we need to rescind green cards and passports of immigrants and try to build up the american economy for the american CITIZENS !!!