The United States wanted to previously intervene in Japan’s conquest of Dutch East Indies and Singapore. However a surprise attack on December 7, 1941 by Japanese on US naval base located at Pearl Harbour which claimed many lives changed the dynamics.
President Roosevelt of the United States signed the beginning of war against the Japanese. He labeled the diplomatic negotiations for possible peace in Asia.
as deceptive.
Diplomatic solutions would have been possible if the attack didn’t take place before the signing of the agreement.