How did American settlers prompt U.S. territory acquisition in some cases?

Question

wwhitlock · Answer

In Texas, Americans moved there with the permission of the Mexican government. They promised to obey all Mexican laws. But then, Mexico got a dictator. 
The Americans and tejanos decided to declare independence. They did, had a little war and became the Republic of Texas.
That lasted a few years before they realized they were going broke. So the Texans asked the US to annex them and let them be a state.

Hawaii was sorta like that only uglier. I can tell you more about that if you want.

anonymous · Answer

Ok. I think I have it so America wasn't happy about Mexico changing the type of government they had.

wwhitlock · Answer

America, the country, didn't take a position on it.
The Americans who moved to Mexico and promised to follow Mexican law had a problem with it. They weren't living in the US any more. They were living in Mexico.
Those settlers in Mexico, rebelled and eventually became part of the US>