Answer:
The United States needed a close enough military base, to plan and execute a full invasion of the Japanese mainland.
Explanation:
Okinawa stood in a strategic position in the Pacific Ocean. Its proximity to Japan provided a good spot of the United States and the Allies to set up a military base to plan a full out invasion of Japan.
From Okinawa, the U.S had a close enough range to deploy their warplanes and also transport their full artillery and since Okinawa was not landlocked, the United States could easily bring in supplies and reinforcements through the Pacific for the battle against Japan.
Because men started fighting WWI
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The Han dynasty tried to fix the problems other dynasties had fallen to, such as government that was too centralized or fragmented. Instead, Han Gaozu allocated power to his family. This didn't work too well either, but the dynasty was still successful.
The Qin dynasty was very short, yet of great importance. The founder, Qin Shihuangdi, established centralized rule and divided China into provinces. He relied on his own loyal servants to rule the provinces rather than established nobility and disarmed regional military forces.
The Zhou dynasty established the Mandate of Heaven, a belief that a ruler's authority came from a higher power and could also be taken away if he acted unjustly. In addition to losing office, a ruler could sometimes have further consequences, like the destruction of his ancestral temple.