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What measures did the Qin dynasty take to consolidate reunification between the north and the south, and what was its historical significance?

Qin Shihuang constantly harassed the Xiongnu in the north, ordered the general Meng Tian to counterattack the Xiongnu on a large scale, seized the Hetao area, and mobilized the mainland people to farm and guard the border. Later, the Great Wall of Wan Li was built.

South China: Develop the economy there, build Lingqu, and connect the Yangtze River system with the Pearl River system, providing favorable conditions for economic and cultural exchanges between the Central Plains and Lingnan.

It means consolidating the rule of the Qing Dynasty.