Is our American Democracy in its Death throes?

Rarely have democracies survived beyond 200 years. Why do democracies fail? Two of the major reasons are: 1) democracies generally progress through an initial period from to spiritual faith escalating to the point where the citizens become totally dependent on the government to where they eventually revert back to , and 2) once the democracy shows signs of prosperity, citizens vote themselves generous bounties from the public treasury. Does this not sound familiar?