Answer: Because Truman asked Stalin for assistance with Japan and Stalin said america did not need the USSR's help.
America first town planner was:
A. William Penn
One widely accepted notion — outside of the medical profession, that is — had German spies deliberately seeding Boston Harbor with influenza-sprouting germs.
I believe they were called unionists as they were part of the Union. The south was the Confederacy therefore southerners were Confederates.
Of the options presented in this problem, the most probable answer to this question would be the first option which is Communication.
Communication would be the roots as to why we all have to advance in the first place. As technological advancements involving communication continues to evolve, it also affects other areas of the society. This includes the military advancements, entertainment, and of course, gaming. As of the modern times, communication still continues to grow even if it is said that it isn't the main concern anymore since it has already been advanced enough. Communication advancements are leading the changes globally.