What was one major effect of the Great Famine in the mid-19th century?

What event brought the us into wwii? what conflicts happened after the us entered the war? i know the first part of this question, i need with the second part.

Brainliesttt !me : ) describe the event : increase in islamic extremis in the middle east

What does jefferson mean when he writes"and to provide new guards for their future security"?