https://www.usconstitution.net/constfaq_q76.htmlThis again - many of these types of democracies and republics are subsets of the other group, definitions change with time but if you want to be technical, the US is/was/hopefully will continue to be a federal republic in the strictest since. This is why:
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 on Application of the Legislature, or of the Executive (when the Legislature cannot be convened), against domestic Violence.
It does have democratic features (direct election of Congress) but it's a federal republic all the way.
Q76. "Is the United States a constitutional republic? Is one of the purposes of a constitutional republic to protect the rights of minorities from the tyranny of the majority?"
A. The United States is a federal republic and a constitutional representative democracy.
I don't know why so many people make a big deal about this. It has nothing to do with our two political parties.