The seven-stage pattern is identical across all three empires: Spain， UK， Soviet Union。
Stage 1 - Military Overextension,
Stage 2 - Currency Debasement,
Stage 3 - Debt Spiral,
Stage 4 - Loss of Productive Capacity,
Stage 5 - Social Decay,
Stage 6 - Loss of Reserve Currency Status,
Stage 7 - Collapse. Spain completed all seven stages between 1590 and 1670. Britain completed them between 1914 and 1954. The Soviet Union completed them between 1945 and 1991. And the United States is currently at Stage 5, with clear warning signs of Stage 6 emerging.
https://www.youtube.com/watch?v=wb39CeK_yWg
美国好在还有加州为代表的统治全球的信息高科技业， 有可能10年20年没事。 但也可能加快崩溃，无论如何应该分散投资美元之外的资产，如黄金和比特币。
