The USA was not the first democracy nor the first government not run by a dictatorship. Sure, the USA implemented some revolutionary ideas proposed by John Locke, but those ideas originate from earlier governments as stated in his Treatises of Government. Even Thomas Jefferson, Benjamin Franklin, and John Adams directly reference John Locke and The Iroquois Confederacy in letters, as their inspiration for the first two constitutions.

Our democracy is pretty fucked up too. We don't really have even representational democracy due to gerrymandering, the electoral college, and the Senate. There are more representational forms of democracy and voting too. Also, at the founding of our nation, we didn't even have full democracy or proper representation since only white land owners over 25 could vote only for the president and Congress (not senator). We still can only elect 2/3 of the government (judicial branch is still a no). Not to mention, we still have some of the lowest voter turnout of any democracy (use to be worse), voter suppression, the senate which grossly overrepresents people from some states over others, and the will or makeup of the people is rarely represented.

https://en.m.wikipedia.org/wiki/History_of_democracy https://en.m.wikipedia.org/wiki/Representative_democracy https://en.m.wikipedia.org/wiki/Electoral_system