The answer is C, the US successfully tested an atomic bomb.
DONT CLICK THE LINK FROM THE OTHER GUY WHO ANSWERED ITS A SCAM
Forced the fedral goerment into heavy debet
Centralized power: all their power went up efficiently and bureaucratically (although that may seem like an oxymoron) to one small group of people. In one case, the Caesar and the Senate (which still had a role during the Pax Romana); in the second case, the Pope and his Cardinals.
