Why was the building of the three gorges dam proposed in 1919 and by whom?

The building of the dam was proposed by Sun-Yat Sen, who is the father of modern China, to protect the river communities from floods.

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Ibelieve it is- a mixed economy offers some protection for consumer rights but still allows a good deal of choice.