What would happen to the economy of the USA if all illegal immigrants are brought back to their countries?

I think there is a reason why the U.S hasn’t done this yet. Most of illegal immigrants work for low wages, pay takes, and don't collect any type of benefits from the U.S (not like they should).
I think illegal immigrants have and are putting in a lot to the economy of this country, and not like some citizens that are able to work but prefer not to work and don't put anything toward society and live all their life on welfare, food stamps, section 8… you name it.
I am not pro-illegal immigration. I believe there should be some changes to immigration laws and forgive some of the illegal immigrants already here, kick out the one all the ones that have committed any type of crime, no matter how small, block the border and start over as a free-illegal immigrant country.

Answer:
We should boot out all illegal immigrants and give the jobs to all the people who are currently a burden to the taxpayers. Like President "Dubya" Bush says, "The people who are here illegally are breaking the law." We can provide job training for the people who want to earn an income but have trouble finding and keeping a job and tell all the parasites who just want a free ride that they have so much time to get off their duffs before they're cut off from welfare.
You are wrong on every point
You say "I think..." but I seriously doubt that.

The immigration information post by website user , MyTend.com not guarantee correctness

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