Identify three factors that may limit Latino population growth in the U.S.

Whether a given population is Latino or not, population growth can be limited by the same things.  Anything that limits the size and growth of a given population is called a limiting factor.  Limiting factors apply to every life form in existence, and humans are no different.  

The three most basic limiting factors that can be applied to any given population are food, water, and shelter.  Those three limiting factors apply to Latino population growth.  I'll lump food and water together for simplicity.  As more and more people crowd into any given area, that puts a strain on food and water supply chains.  While it is imaginable that suppliers could keep up with the demand, it's also likely that prices soar because of the increased demand.  Eventually, there is going to be a group of people that simply can't afford to feed themselves.  The population can't get bigger, because the new additions don't have access to the basic needs.  

Shelter applies to Latino populations as well.  In this case, it would be housing.  As the housing market continues to rebound, housing costs go up.  As the population grows, there are fewer and fewer affordable homes.  That could in turn limit the population growth of any given group.  

A third limit to Latino population growth in the United States is a political and legal limit.  As the United States tries to tighten up border security, that makes it harder for Latinos to enter the United States.  That in turn will slow the population growth for that particular group of people.