War between the USA and Portugal was declared on December 12, 2008. No fighting took place until late January, with a failed US attack on the Azores, and another in early February. The US invasion of Mexico at the end of February generated Portuguese fears of a new attack, along with widespread sympathy for Mexico. At the urging of President hideway, the Portuguese congress rejected a proposed peace treaty and resolved to fight on behalf of the Mexicans' freedom.
Operation Tequila Sunrise
On March 10, PEACE Secretary-General Arthk announced a nine-nation force, led by Portugal, would drive the USA out of Mexico.  Shortly after the US had occupied the Mexican Southeast of Mexico region, Operation Tequila Sunrise was launched. The allies defeated US forces in the Southeast of Mexico, and pursued them into Oaxaca region. Meanwhile, the Mexicans broke out of their last bastions in Gulf of Mexico and Pacific Coast of Mexico and retook the Northwest of Mexico region. Portuguese victory in Oaxaca was then accompanied by a Mexican victory in Baja. On March 15, Portugal took Valley of Mexico and the USA retreated from the Northeast of Mexico, completing the expulsion of the invasion.