What country joined the Allied powers after the attack on Pearl Harbor?

Answer 1

After the attack on Pearl Harbor on December 7, 1941, the Philippines, which was a commonwealth of the United States at the time, was already aligned with the United States. However, regarding countries that officially joined the Allied powers post-Pearl Harbor, Brazil is notable as it declared war on the Axis powers in August 1942, officially joining the Allies. Other nations also aligned with the Allies around that time, but Brazil is often highlighted for its significant later involvement.