What's your most embarrassing story?

Which event was one of the greatest factors that led to massive emigration from ireland to the united states in the mid-1800s? a) world war i b) the civil war c) the irish potato famine d) colonization of the new world plz fastest and right answer gets 94 !

I'm in a few lessons on eastern europe and i need me don't leave me hanging. : {

Drag and drop the reasons for widespread discontent around the world in the early 1900s.