Answer:it freed enslaved persons living under confederate control , it signaled that the civil war was a war to end slavery
Explanation:
The correct answer is A) It brought about the unconditional surrender of Japan and ended the Second World War.
President Harry Truman decided two use two atomic bombs on the cities of Hiroshima and Nagasaki in August of 1945. The goal of these attacks were to bring an immediate end to World War II. This was seen as a last resort for Truman, as he and other leaders of the Allied powers already asked the Japanese to surrender. The Japanese refused to an unconditional surrender. If the US did not use these weapons, the war could have lasted significantly longer.
The main reason why Cambodian genocide perpetrators have not been brought to justice are the incompetent and alleged corruption of the local tribunal court, and lack of support from international community as well as the death and sickness of several witnesses and perpetrators.