What was a major push factor that increased immigration to the United States between 1830 and 1850?

A PUSH factor would be the Irish Potato Famine

Explanation:

For reference, a pull factor is something that is enticing about the area you want to move to. (ex: promise of land, money, glory, etc)

A push factor is something happening where you live that makes you not want to live there anymore. (Ex: famine, war, disease, religious persecution)

Here, it is important to note that improvements in ships and voyages would NOT be a push factor. Nothing is forcing people to leave their home. (A person would not want to leave just because the USA has ships.

A pull factor that is true to the time period would the the Potato famine that started around the 1840s, and affected Ireland, Northern Europe, etc.

answer: president kennedy is vowing to protect freedom in this paragraph.

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.