Which element of federal government best reflects the constitutional principle of the separation of powers?

The main element of the aforementioned, which contributed to the understanding and the effective division of powers, is the creation of the three arms of government, based on the idea of Montesquieu: executive power (president, governors and mayors), legislative (House of the Representatives and the Senate) and judiciary (judges). This element is not only fundamental, but the essence of the division of powers, which seeks to decentralize government. So ur answer to this question The creation of three branches of government