The Plan of San Diego was _______________________.

The Plan of San Diego was indeed a Mexican plan that aimed to reclaim territories that were lost during the Mexican-American War, specifically targeting Texas, New Mexico, Arizona, Colorado, and California. This plan emerged around 1915 during a time of significant unrest and revolutionary activity in Mexico, fueled by the broader context of the Mexican Revolution and the desire for territorial expansion by some factions.

The plan was motivated by discontent with American control over these regions, which many viewed as historically and culturally Mexican. The goal was to incite uprisings and establish a revolutionary front in the southwestern United States, reflecting sentiments of nationalism and a pushback against perceived imperialism.

Other options present ideas that do not align with the historical context of the Plan of San Diego. It was not a German plan, nor did it focus on General Pershing or involve a direct American strategy against Mexico. Instead, the plan was distinctly rooted in Mexican revolutionary aspirations to reclaim lost land.