How were the political ideologies of the United States and the Soviet Union different

How were the political ideologies of the United States and the Soviet Union different during the Cold War? The political system of United States was run by a single executive with supreme power, while the Soviet Union had a limited monarchy.

A basic component of the United States system was federalism, while the Soviet Union was founded as a republic.

The political system of the United States was based on rule by the people, while the Soviet Union had a totalitarian government.

The political system of the United States was grounded in direct democracy, while the Soviet Union was ruled by the politburo system.