D. they were active in the abolition movemen.
Answer:
Atomic Bombs
Explanation:
Those cities were the place where the American Government conducted the Manhattan Project.
That project cost the government around $ 2 Billion with the purpose of creating mass destroying weapons that can turn the tide of war in one's favor. Eventually, it led to the creation of Atomic Bombs.
In the world war 2, US military dropped 2 of those atomic bombs, on the City of Hiroshima and Nagasaki In Japan. Killing around 146,000 people in Hiroshima and 80,000 people in Nagasaki.
This left the Japanese Government with no choice but to surrender, and make United States and its allies as the winner of world war 2.
The answer is True Hope this helps! :D
It become a concern of the military planners due to the high casualty the marines suffered during the taking of Iwo Jima. Also the battle proved that even though the battle was an American Victory the Japanese army is prepared to die defending and willing to wage a suicide attacks even though they already know that they lost the war. That also attacking the Japanese Home Islands would be a costly attack of lives of american soldiers and the new strategy develop in Iwo Jima would be an arduous battle if the Americans would invade the Japanese Island with the Japanese people that is already to prepare to die fighting.
