This document provides a summary of Sun Yat-sen and Yuan Shikai, two leaders in early 20th century China. Sun Yat-sen was a key influencer of the 1911 Revolution that overthrew the Qing Dynasty and established the Republic of China, though he was not directly involved. Yuan Shikai also played an important role in the revolutionary events and later became the first President of the Republic of China. The document suggests comparing their roles and influence during this pivotal period of Chinese history.