[Cboldt]

-- Says so right in the Constitution and the Bill of Rights. These are the three due to Federalism as the backbone. --

The original contention was ...

One in three Americans can't name a single branch of the U.S. government

... so would, I think, be looking only at what you denominated "3. Federal."

[C210N]

Yep, I was stretching the question a bit, from US government to just plain “government”.

So, a bit facetious... but makes a point.