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
美國好在還有加州為代表的統治全球的信息高科技業， 有可能10年20年沒事。 但也可能加快崩潰，無論如何應該分散投資美元之外的資產，如黃金和比特幣。
