A) gunpowder was the invention
D is the answer for this question as it is the most likely.
Explanation:
World War II started in 1939 and ended in 1945. More than 100 million people from 30 nations participated in the war, resulting in anywhere from 70 million to 85 million civilian and military casualties. World War II was the deadliest war in history. Leading up to the war, many countries tried remaining neutral.
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Tax the people
could not ensure laws were carried out
could not controll trade between states
