What was so special about America in it's first few terms that didn't turn into another dictatorship or a democracy with tyrannical rule? I know about Washington refusing leadership a few times but what prevented the then future presidents from abusing their power to hold onto it forever?
You are implicating so much here in your question and post. People here don't like loaded and leading question with hidden implications.
So if you are serious, edit it to bring some resemblance of neutrality in your post.