On 22 May 1942, Mexico entered the Second World War by declaring that a state of war existed with Germany, Italy and Japan, aligning itself formally with the Allied powers after German submarine attacks on Mexican oil tankers in the Gulf of Mexico. The decision transformed Mexico from a cautious regional power into an active wartime participant and strengthened its strategic relationship with the United States.
A neutral country pushed into war
Mexico had initially sought to remain outside the global conflict. That position became impossible after the tankers Potrero del Llano and Faja de Oro were torpedoed by German U-boats in May 1942. The attacks killed Mexican sailors and created a direct national security crisis. President Manuel Ávila Camacho moved to secure congressional support for war against the Axis powers.
A formal break with the Axis
The declaration stated that, from 22 May 1942, a state of war existed between Mexico and Germany, Italy and Japan. It was a historic step: Mexico had not previously played a major military role in a world conflict, and the declaration placed the country firmly inside the Allied coalition.
Strategic importance
Mexico’s contribution was not only symbolic. The country supplied oil, raw materials and labour support to the Allied war economy. Its cooperation with Washington deepened through military, industrial and labour arrangements, including the wartime movement of Mexican workers into key US sectors.
The Aztec Eagles
Mexico’s most visible combat contribution came later through the 201st Fighter Squadron, known as the Aztec Eagles. The unit served in the Pacific theatre, including operations connected to the liberation of the Philippines, giving Mexico a direct military role against Japan.
A lasting legacy
Mexico’s entry into the war reshaped its international position. It strengthened US-Mexican relations, elevated Mexico’s role in hemispheric security and showed that the Second World War was not only a European or Asian conflict, but a global struggle that reached deep into Latin America.
Newshub Editorial in North America – 22 May 2026
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