Question

4. What was D-Day and why was it significant?

Answer 1

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. In World War 2 , the soviet union lost the most soldiers and civilians in the war.

10. In World 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.

Answer 2

~4. It Is The Largest Military Operation By The Sea In History, And Of Course It Had Great Significance To The War.
~5. The Strategy Of the Island Hoping Was A Military Strategy Employed By the Allies In The Pacific War Against Japan And The Axis Powers During World War ll.
~6. The Manhattan Project Was The First Detonation Of A Nuclear Weapon.
~7. The Americans Contributed To The War Effort By Rationing Consumer Goods, Recycling Materials, Purchasing War Bonds, And Working In War Industries.
~8. The Internment Of Japanese American's In The United States During World War ll Was The Forced Relocation And Incarceration In Camps In The Western Interior Of The Country Of Between 110,000 And 120,000 People Of Japanese Ancestry, Most Of Whom Lived On The Pacific Coast.
~9. The Soviet Union Lost Most Soldiers And Civilians In The War, 24,000,000 Civilians And Soldiers Died.
~10. After World War 2 was The Cold War Between The United States And Russia.

Hope all of this helps.