Both Brazil and Mexico fought the Axis Powers.
Here's What You Need To Remember: In 1944, Brazil dispatched an entire division of U.S.-equipped ground troops to battle in Italy as part of the Brazilian Expeditionary Force, as well as a wing of P-47 Thunderbolt fighters.
We often think of the Battle of the Atlantic primarily as the conflict pitting Axis submarines against American and British convoys in the North Atlantic. However, the Kriegsmarine’s submarines also ravaged shipping off the coast of South America. A spate of attacks on Brazil’s then-neutral shipping proved to be ill judged, however, as Brazil’s entry into World War II as a U.S. ally led to the defeat of the U-boat campaign in the South Atlantic in just twelve months.