Where were most people concentrated in ancient china amd why

The ethnic Han in China, about 1.3 billion people, live all over the country, but most are concentrated in their ancestral homelands in the provinces that are along the middle and lower parts of the Yellow River Basin, along the Yangtze River basin, and along the Pearl River.

Explanation:

The muckrakers played a highly visible role during the Progressive Era. Muckraking magazines—notably McClure's of the publisher S. S. McClure—took on corporate monopolies and political machines, while trying to raise public awareness and anger at urban poverty, unsafe working conditions, prostitution, and child labor.