What event triggerd the start of world war 1?

Civil liberties in latin america vary. this means that

In a modern democracy all elected officials serve for a certain number of terms then must retire a high school sophomore and a senior citizen may vote at the polls together a united states senator votes on immigration law on behalf of your mother through indirect ballot all democracies have a two chamber system of representation united states citizens live in a direct democracy

Which statement about the damages caused by the civil war is true?