In my opinion, the biggest problem with the United States is that people no longer trust our government. The federal government has lost all of it's credibility, lies to the people, doesn't represent the people, and is far too powerful. Back in the 1700s and 1800s people trusted the government and the government didn't have all of these conspiracies they were performing against the American people. Our elected officials actually cared and were real people like you and me, not people like Obama or Bush or any of these clowns in Congress.
And to be honest, the people are partially responsible for this. Yes, it is important for the federal government to have some power, as to preserve the union, but we're hardly a union anymore, now we're just a single nation-state just like Russia or France. We're not a union or a confederation. People rely on the federal government for everything, instead of relying on their state governments.
The Constitution is a joke now, it's a wonderful document, but our own government only abides by it when it is convenient for them to do so. They have the CIA out there killing our own people simply because they "know too much," we have wiretapping and the Patriot Act. We have them keeping secrets from us and committing acts that are detrimental to the lives of Americans. We have horrible liberals who want to ban guns. We have abusive police forces and corrupt public officials who don't listen to the people. We need an honest government again, one that fully understands and respects the Constitution and that is by the people and for the people.