All empires collapse. Some have a shorter shelf life than others, but all eventually share the same fate. The Roman empire survived in the East until 1453, and survived (at least in name, if not in fact) in the West until the 1806. But it collapsed. The Soviet Empire also collapsed, nearly instantaneously, by Roman standards. The United States has been around along time by modern standards. Our political regime is actually older than any other in the world right now. The British monarchy is older, but survives mostly as a living tourist attraction and drain on the public treasury, rather than as a real political regime. Despite being a "young" country, we actually the longest-running continuous political regime on the planet right now. Older than anybody. Can we continue? Empire is an expensive proposition, a hobby of the rich. Are we rich enough to maintain our empire?
Here is a truly interesting presentation by Dmitry Orlov about the comparisons between the collapse of the Soviet empire and the (rapidly approaching collapse) of the American empire. One does not need to agree with Mr. Orlov entirely, but his analysis is useful. It is at least amusing, and that's always worth something in an election season. His observation on American elections:
It is certainly more fun to watch two Capitalist parties go at each other than just having the one Communist party to vote for. The things they fight over in public are generally symbolic little tokens of social policy, chosen for ease of public posturing. The Communist party offered just one bitter pill. The two Capitalist parties offer a choice of two placebos. The latest innovation is the photo finish election, where each party buys 50% of the vote, and the result is pulled out of statistical noise, like a rabbit out of a hat.