What is a constitution ?why do we need a constitution ​

The supreme law of the country is called constitution.

Explanation:

We need constitution to maintain law and order in the country.

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.