What are the pros and cons for Immigration?

I'm going to debate on Wednesday about this.
My team is against illegal immigrant having rights.
I did not choose the topic, I just have to debate against it.
We have to break down the topic into 7 sections.
I got morals.
What would I say if I be to talk about morals and against immigration?
What are some good question to ask my opponent and please what is some good information on why this it is morally wrong and right to be against immigration or for it?
What is good information more or less against and for immigration?
I need to know about both sides so I can fire back if they something.
Can someone please minister to me?
Answers:   
Say that you have a tooth ache and cannot go
The topic is hot iron.

People own been coming here since the discovery. What can you say ? The country was created by immigrant, and those that came first had no visas from the Native American authorities, I am sure of that

Some people influence that there were no laws after against immigration, but that is a lawyer's argument

The government made a deal near the tribes to respect certain territories, considered sacred by the Native Americans. But latter gold was found and miners invaded the territory. Then the Native Americans fixed to apply their own laws, scalping miners.
Finally, the invaders got the message and left
You seem to be to be one of those that don't get it immigration is O.K. if it is legal. It's the Illegal immigration that is the problem, family that come here illegally will continue to do illegal things, resembling obtaining illegal documentation, or work under the table & not settle up taxes, or sponge the social services, & on & on.

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