Actually, we're not a democracy, thank God.
You don't even know the difference do you? Just because democracy sounds like Democrat and Republic sounds like Republican you associate those terms with the parties. Nothing could be further from the truth.
www.diffen.com/difference/Democracy_vs_Republic
The key difference between a
democracy and a
republic lies in the limits placed on government by the law, which has implications for minority rights. Both forms of government tend to use a
representational system — i.e., citizens vote to elect politicians to
represent their interests and form the government. In a republic, a constitution or charter of rights protects certain inalienable rights that cannot be taken away by the government, even if it has been elected by a majority of voters. In a "pure democracy," the majority is not restrained in this way and can impose its will on the minority.
Most modern nations are
democratic republics with a constitution, which can be amended by a popularly elected government. This comparison therefore contrasts the form of government in most countries today with a theoretical construct of a "pure democracy", mainly to highlight the features of a republic.