Why did president truman decide to drop the atomic bombs on japan?

While the United States began conventional bombing of Japan as early as 1942, the mission did not begin in earnest until mid-1944. Between April 1944 and August, 1945, an estimated 333,000 Japanese people were killed and 473,000 more wounded in air raids. A single firebombing attack on Tokyo in March 1945 killed more than 80,000 people. Truman later remarked, “Despite their heavy losses at Okinawa and the firebombing of Tokyo, the Japanese refused to surrender. The saturation bombing of Japan took much fiercer tolls and wrought far and away more havoc than the atomic bomb. Far and away. The firebombing of Tokyo was one of the most terrible things that ever happened, and they didn't surrender after that although Tokyo was almost completely destroyed.”

In August 1945, it was clear that conventional bombing was not effective.

Jackson  said nullification 'means insurrection and war,' and called it a treasonous attack on america. the second aspect of the  force bill  was the passing in congress of a lower tariff in 1833. this was offered as a compromise to avoid conflict with south carolina, and to attempt to defuse the tense situation.source google

Is the keeping of the rights and freedoms of the people because people need their rights to survive and people need freedom not being locked in a type of prison where they can't-do something they're allowed to do. freedom is given to everyone when they're born