What was the biggest reason the government of south africa created a policy of apartheid?

to keep different races and ethnicities separated in order to avoid conflict.

Explanation:

Apartheid is the name given to a policy that operated in South Africa until the 1990s. This policy allowed the legal, political and economic segregation of non-white ethnic groups. The policy was intended to keep different races separated in order to avoid conflict. However, it lead to enormous discrimination of different ethnicities, to the benefit of the white population.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )