I think it's A nucleus because it is the control center of it
In post-war Japan, the United States implemented a policy of "rebuilding the nation" The Allies had learned their lesson after WWI, when they were too harsh on the losers.
Alexander Graham Bell invented the TELEPHONE in 1876. It is a device that lets two people have a conversation even when they are far from each other. This could be done by sending signals through cables. Alexander Graham Bell began a new era of communication with his invention of the telephone.