I have to design a poster which analysis a contemporary issue and then submit a 1,000 word written summary. I want to do it on climate change. Do you have any pointers for me

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 !