What event caused citizens to support programs for those in need

Although a number of things brought about world war one there was one even that push to europe over the edge. what was that event?

The fourteenth amendment how did the action resolve a longstanding conflict in post-civil war america? it defined the process for readmittance of the former confederate states into the united states of america. it ensured the right to vote to all male citizens of the united states, regardless of race, color, or prior servitude. it defined citizenship and related rights for african americans. it abolished slavery in the united states.

Why do you think the delegates to the first contintal congress believed that refusing to buy british goods would their cause?