How did the introduction of zoning change cities?

Zoning is the procedure of splitting the land into zones in which certain land are allowed or forbidden. The proportions,  volume, and positioning of construction may be regulated. The kind of zone settles whether planning authorization for a development is accepted.  "Zoning may specify a variety of outright and conditional uses of land." ← (Wikipedia) The instructions are in control to lead urban expansion and evolution.

i think it would be reparing roads  

in 1989, tiananmen square in beijing was the site of china’s main industries. china’s government headquarters. -pro-democracy demonstrations. (second choice)