What historical event caused the change illustrated by the maps?

The end of the British Empire in India in August 1947 resulted in the creation of two separate states of India and Pakistan. The division was based on religious lines, a Muslim majority in Pakistan and a Hindu majority in India.

Explanation:

the answer is

a) revise existing treaties

b) do away with political alliances

c) prevent the spread of communism

d) bring an end to european colonization

the main goal of the southeast asia treaty organization was to prevent the spread of communism in southeast asia.

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.