According to the countdown clock, published on tickcounter.com, Trump’s last day in office will be January 20, 2021, which is 3 years, 11 months and 28 days away.
Explanation:
During 1989 and 1990, the Berlin Wall came down, borders opened, and free elections ousted Communist regimes everywhere in eastern Europe. In late 1991 the Soviet Union itself dissolved into its component republics. With stunning speed, the Iron Curtain was lifted and the Cold War came to an end.
Make Japan surrender unconditionally.
Also that it would cost less American lives.
Those who supported the use of the atomic bomb believed that Japan would surrender after a large scale attack. They also believed that it would be better than an American invasion as it would result in less American casualties.
Hope this helps!