Your statement is incorrect. Judging from today's China, the Qing Dynasty was the only dynasty that truly unified China, but not from the perspective of feudal dynasties. Just because the so-called unified dynasties of Qin, Han, Western Jin, Sui, Tang, Yuan and Ming all existed in China, it can't be called a truly unified China. However, the Qing Dynasty completely covered 9.6 million square kilometers of land in China today, and China had no political power. To sum up, the Qing Dynasty was the first dynasty that truly unified China, but it was not the only unified dynasty in the history of China.