democratic
Because it had a republican form of government prior to the civil war. The fundamental form of the US government has not changed since its formation 234 years ago.
The External home affairs is the one form of Indian government to constitute to the us government.
They use an Emirate government.
This form of government is known as a republic.
You could say that...
A constitutional republic
Democracy
The US started out with, and still is, a republic.
Greece
The form of government was Anachronism.
Rome
Constitution