Democracy” derives from the Greek terms demos meaning “common people” and kratos meaning “rule, strength,” which together morphed into demokratia meaning “popular government.”
Few would argue that the government of the United States does not derive its power from its people. In fact, one of the greatest American presidents, Abraham Lincoln, described our nation as having a “government of the people, by the people [and] for the people.”
Proponents of America as democracy identify a few fundamental principles common to democracies, including “democratic representation, the rule of law, and constitutional protections,” and this is consistent with Aristotle’s primary criterion for a democracy, which is that each person shared in “numerical equality.”
The U.S. government in the modern era has, likewise, discarded the limited definitions of pure democracy and direct democracy in favor of an expanded version:
Democracy is the institutionalization of freedom . . . .[P]ower and civic responsibility are exercised by all adult citizens, directly, or through their freely elected representatives . . . . [where] all levels of government must be as accessible and responsive to the people as possible . . . . [and] protect such basic human rights as freedom of speech and religion . . . equal protection under law . . .[and] the opportunity to organize and participate fully in the political, economic, and cultural life of society.
Ultimately, in a democracy, “regular free and fair elections open to citizens of voting age” are the norm.
This is certainly the case in America and each of its fifty states. So, clearly, the United States is, under the modern definition of the term, a democracy.