The establishment of three branches of government is meant to ensure that

to ensure that powers of three branches of government are separated.

Explanation:

The establishment of three branches of government: legislative, executive, and judicial is meant to ensure separation of powers. Each branch of government has its own powers and responsibilities to ensure that the government works effectively and citizens' rights are protected.

The legislative branch makes laws, the judicial branch can declare those laws and the executive branch can veto those laws with the consent of the president.