Final answer:
Landowning nobles and privileged elites were the common social groups that the Russian, Chinese, and Mexican Revolutions all struggled against. These groups fiercely resisted reforms that threatened their status and were seen as the main obstacles to social and political change, leading to widespread revolutionary movements in the early 20th century.
Step-by-step explanation:
The social group that the Russian, Chinese, and Mexican Revolutions all had problems with were the landowning nobles and privileged elites. In Russia, the nobility was resistant to any change threatening their status, contributing to a rigid social structure and stoking revolutionary fervor among those who were oppressed, particularly the peasants and working class. Similarly, the Chinese Revolution was fueled by a desire to overthrow the feudal landowners and establish a socialist state. In Mexico, the Revolution was a response to the inequalities perpetuated by the peninsulares and creoles who monopolized land and power, displacing peasants and indigenous people.
The push for reform and the outcry against stagnant and unresponsive political systems led to discontent and eventual revolutions in these three nations. Each encountered opposition and conflict with landowning elites and upper classes, who were seen as the main obstacles to social and political reform. This commonality highlights a global pattern of 20th-century revolutions where disenfranchised groups sought to dismantle established power structures and redistribute power more equitably among the population.