Answer:
John D. Rockefeller
Explanation:
John D. Rockefeller is the richest American who ever lived. At the time of his death in 1937, Rockefeller was worth the equivalent of $340 billion in today's dollars.
D. Czechoslovakia is correct. All others had been concered by Hitler and Nazi Germany.
Answer:
Mutual defense alliances was a significant cause for starting World War I. Basically, what happened was all of the countries were somehow alliances with other countries. Conflict between different countries caused the allied countries to be involved which eventually led to World War I.
Explanation: