[MosesKnows]

...we are a representative republic...
No, we AREN'T! We are a Constitutional Republic

America's government is officially a constitutional federal republic.

However, the more important aspect of constituting America is Article 4, section 4 of the Constitution.

The United States shall guarantee to every State in this Union a
Republican Form of Government,
and shall protect each of them against Invasion; and against domestic Violence.

[philman_36]

America's government is officially a constitutional federal republic.
Simply ask yourself this...what establishes the federal aspect of which you speak?

It all evolves from the Constitution and is laid out within the Constitution.