4. what was d-day and why was it significant?
5. what was the strategy of island hopping?
6. what was the manhattan project?
7. in what way did americans at home contribute to the war effort?
8. why did the nation put thousands of japanese americans in internment camps during the war?
9. which nations lost the most soldiers and civilians in the war?
10. what international tensions arose after world war ii?

4. D-day stands for designated day was the day of the Normandy landings ( Tuesday, 6 June 1944) ,this was perhaps ,if not the most important day for the allies during .It was the largest seaborne invasion in history.

5.Island Hopping or Leapfrogging was a strategy during World War II (WWII) implemented by the Allied forces against Japan and the Axis forces. The point of the strategy was to avoid Japan's fortified centers, and instead reach Japan through and by capturing the Pacific Islands (which were less fortified). 

6. The Manhattan Project was a research development project that made the first atomic bombs during WW2 -- the United States led it with the help of the UK and Canada

7. By lowering the unemployment precentage

8. During the war, an appeal reached the Supreme Court contesting the government's authority to intern people based on their ancestry; the court sided with the government. The U.S. government officially apologized for the internment in the 1980s, saying it was based on "race prejudice, war hysteria, and a failure of political leadership", and paid reparations to survivors. Some reparations were also paid in 1948, and Congress passed eight compensation-related laws between 1951 and 1978.

9. InWorld War 2 , the soviet union lost the most soldiers and civilians in the war.

10. InWorld War 2

The nuclear weapons that the super power countries had caused international tensions after World War 2. This caused the Cold war between the US and Russia.