What were the pressures on the united states government to push for expansion?

1. Free land

2. Mexico was not strong enough to hold back the American invaders.

3. Immigrants from Europe wanted land.

4. Population growth fueled the need for more land.  

5. The USA wanted to grow and become a more powerful and significant country at the expense of Mexico, Canada and the Indians.

Explanation:

i also think he is correct. i believe they came to washington to protest their rights.