In regard to the article about the NYC Mayor, please understand that these 50 United States do NOT form a Democracy. 

Article IV, Section 4, Clause 4 of our Constitution says: 

“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.”