Their beliefs such as religion.
In my opinion, it has made a very “us versus them” look on both sides of the spectrum.
I would say 30,000 cause all the next developments were from the 1860's forward and that is when huge growth happened, after 1860.
The correct answer to this open question is the following.
The historical circumstances that led to Mao Zedong’s delivery of the speech entitled "Proclamation of the Central People’s Government of the People’s Republic of China," were the following.
Mao Zedong (1893-1976) led the Communist Army during the Chinese Civil War. He led the troops that defeated the Nationalist Army and that is why he became the leader of China and got to power in 1949. After led almost 100,000 people in the so-called "Long March," Mao counterattacked and defeated the troops of Chiang Kai-Shek. So on October 1, 1949, in front of his followers gathered in Tiananmen Square, Mao established the Communist government of the People's Republic of China.