Why was Ngo Dinh Diem an unpopular
ruler?

Diem's government was also unpopular because it had an overwhelming Catholic bias and contained several unpopular, key figures who were members of Diem's own family, the Ngo family. Diem's brother Ngo Dinh Thuc, the influential Catholic archbishop of Hue, in particular came into conflict with Buddhists.

Explanation:

Diem's government was also unpopular because it had an overwhelming Catholic bias and contained several unpopular, key figures who were members of Diem's own family

your answer would be just capitalism.

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.