What is the significance of the push-pull factor?

http://www.tutor2u.net/blog/index.php/geography/comments/study-note-push-and-pull-factors-behind-migration

So then, the significance of the push-pull factor would be that they were the reasons that pushed people out of their native lands and pulled them towards America?

What were some push factors?

What about pull factors?

The pull factors included population growth, agricultural changes, crop failures, industrial revolution, and religious and political turmoil.

The three main pull factors were freedom, economic opportunity, and abundant land.

Right.

Your first sentence is about push, not pull, factors.

Oh. I'm sorry. That was my mistake.

So then, is my answer correct?

They're right -- I hope you understand them.

So then, the significance of the push-pull factor would be that they were the reasons that pushed people out of their native lands and pulled them towards America, is correct?