When US decide to drop a bomb on japan?

The United States decided to drop atomic bombs on the Japanese cities of Hiroshima and Nagasaki in August 1945, during the final months of World War II. The decisions were made by President Harry Truman and his advisors after Japan refused to surrender following the Potsdam Declaration, which warned of "prompt and utter destruction" if Japan did not surrender. The bombings resulted in the deaths of hundreds of thousands of people and ultimately led to Japan's surrender.