The First World War destroyed empires, created numerous new nation-states, encouraged independence movements in Europe’s colonies, forced the United States to become a world power and led directly to Soviet communism and the rise of Hitler. Diplomatic alliances and promises made during the First World War, especially in the Middle East, also came back to haunt Europeans a century later. The balance of power approach to international relations was broken but not shattered. It took the Second World War to bring about sufficient political forces to embark on a revolutionary new approach to inter-state relations.
The Korean War or conflict can be compared to the Vietnam War. The basic reason behind the United States taking a active role in these wars was to stop independent nations falling under communist control.
Yellow or red hope it helps you
The answer would be D a deep pit for religious purposes
Transcript of Causes and effect of European expansion, however I am not for sure.