> and I think other countries in South America do to

Nope, only Chile, and not even the whole Chile. Similarly, Egypt is the only exception in Africa, Lebanon/Palestine/Israel are the only exceptions in Asia, plus also New Zealand and like half of Australia.

The vast, vast majority of the world including China, India, Mexico, Russia, Iran, Turkey and so on don't move their clocks. In fact, out of 20 most populous countries in the world, only three do: United States, Egypt and Germany.