I'm doing a research essay about "anchor babies", or in other words, babies born from illegal immigrants.

How would you write a good thesis?

What do you want to say about these babies?

Your thesis statement must include factual information plus your position/opinion/stance. Without your position on the topic, it isn't a true thesis statement. So think of this sentence as the angle you want to take on the topic and what you intend to prove by the end of your paper. (If your statement is simply factual, then there's nothing to prove!)

http://leo.stcloudstate.edu/acadwrite/thesistatement.html
This is one of the very best places I've seen online to help students write good thesis statements. It shows you sentences that aren't thesis statements and how to turn each one into real thesis statements.

I basically want to solve this problem and I want to talk about people's reaction, pros & cons, etc.

Solve what problem? State the problem clearly in one sentence. (Ignore the rest for now.)

As Writeacher said, you need to take a position on this question. How would you solve this "problem"? Your solution should be stated in your thesis.

Well so far I have my intro.

which is this:
Throughout the years, it has been known that if one's newborn is born in America, they have automatic citizenship, regardless of what their parent's situation may be; which is what the 14th Amendment states. Illegal immigrants are now having "anchor babies" in the United States that have caused the nation to have doubts about this amendment. Everyone is entitled to their own opinion on how this problem should end, but it must be resolved.

Good? Or no?

Which ONE SENTENCE is your thesis?

If you don't have a thesis yet, why are you wasting time writing an introduction to a paper you haven't written yet?

Please just tell us what you think your thesis statement is -- even if you think it's in rough draft form.

Caution:

"Illegal immigrants are now having "anchor babies" in the United States that have caused the nation to have doubts about this amendment."

This cannot be your thesis statement as it is because your opinion, your stance, your position is not included.

The thesis can only be in one place, which is the ending of the introduction.

My thesis: "Everyone is entitled to their own opinion on how this problem should end, but it must be resolved."

This "Illegal immigrants are now having "anchor babies" in the United States that have caused the nation to have doubts about this amendment." is not my thesis. its just like background info.

"Everyone is entitled to their own opinion on how this problem should end, but it must be resolved."

That's not a thesis statement. No one would disagree with you about this. It's a statement, not a thesis.

I gave you a link above to a marvelous webpage to teach you about thesis statements. Did you read it? Did you compare your sentence with the ones in there ... and their revisions?

Try again.