What was the main purpose for separation of powers?

The intent of separation of powers is to prevent the concentration of unchecked power by providing for "checks" and "balances" to avoid autocracy, over-reaching by one branch over another, and the attending efficiency of governing by one actor without need for negotiation and compromise with any other.

Explanation:

Separation of powers, therefore, refers to the division of government responsibilities into distinct branches to limit any one branch from exercising the core functions of another. The intent is to prevent the concentration of power and provide for checks and balances.

the puritans were a group of people who grew discontent in the church of england the common unity strengthened the community.

probably that america is racist