Migration:-
Migration is to leave the country you live in, your own country and go live in another country you chose forever.
Before Japan bombed parole harbor we didn't want to get involved in any of it. so the answer is D because that's when we got involved with other countries again.
Estimated - 1851.2. Basically multiply the original number (1500) by 5.4; 4 times. Make sure every multiplication involves the new number rather than using 1500 every time. e.g. if 10% more of 100 is 110. Then 10% more of 110 is 121