By its very name your "Federal Republic" is what is incorrect and incomplete. A Federal Republic can be created without a Constitution. A Constitutional Republic has to have a Constitution,, which America does.
The US is a Federal Republic, according to its constitution, and, a democracy.
The US is a Constitutional Republic because of the Constitution. Your very words prove it.
And, once again, show me anything that shows the nation was created as a democracy. You've yet to do so.
A majority vote in the House or Senate does not a democracy make.
Give me an example of a country today which is officially known as a Federal Republic and has no constitution?
"A majority vote in the House or Senate does not a democracy make."
Read my post #87 again regarding the term "democracy" and its modern definition. Clue: It does Not specify "majority vote".
If you still don't understand, or unwilling to accept as it is clearly apparent, then end of discussion.