Answer:
Believed that it was the way to end the war
Explanation:
For the United States to end the war with Japan it had to invade mainland Japan. This was extremely hard even when compared to the D-Day invasion. They calculated that they would need to loose many men and Japan would lose even more soldiers and civilians. They settled on dropping the bombs for them to surrender. At the end this did not bring Japan to surrendering and the thing that pushed them to surrender was the USSR invasion that they could not defeat. And better to surrender to USA than to the USSR.
the 19th amendment, passed in 1920
Treaty
So a treaty requires the consent of the United States Senate to come into effect while an executive agreement does not.
