Answer:
England, Spain, and France
Explanation:
As a consequence of the large indebtedness acquired after both the Mexican-American War (1846-1848) and the Reform Wars (1857-1861), the Mexican government faced such economic difficulties that president Benito Juarez suspended interest payments to foreign countries on July 17th, 1861. This angered France, Spain and England, who united their efforts to apply gunboat diplomacy on Mexico, and force it to continue with these payments. On December 8th of the same year, the Spanish fleet and troops from Spanish-controlled Cuba arrived at Mexico's main Gulf port, Veracruz.
