All empires collapse eventually. It is only a matter of time and the intensity of corruption. The United States is no exception. Pressure can also come from outside, but in the case of the United States, the ameridumbs are stupid enough to ruin the empire themselves. The US empire holds out mainly because it is supported by outside/alien forces: investors, students or low-wage workers. When the US authorities put an end to the influx of immigrants, the blood that runs in the veins of the American economy will dry up and their production system will gradually slow down. This will leave room for other nations to become more attractive. The US strategy of last resort will be a direct war against these emerging powers. Hopefully it will then be too late, because the world is much more globalized and the other superpowers will unite against the declining American empire. Hopefully...