Answer:
Step-by-step explanation:
The answer is (B) The Mexican Revolution, as middle classes and peasants united to oust longtime dictator Porfirio Díaz and establish a more equitable society. The "weakening of the conservative principle" implies a shift away from traditional or established political structures and beliefs, and towards more progressive or liberal ideas. The Mexican Revolution of 1910-1920 was a significant example of this trend, as it saw the overthrow of the long-ruling Porfirio Díaz and the establishment of a more democratic and egalitarian government. The revolution was led by a coalition of middle-class reformers, landless peasants, and indigenous people who sought to address social, economic, and political inequalities in Mexico. This movement represented a challenge to the conservative status quo, and its success marked a major turning point in Mexican and Latin American history.