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The huge two spikes up in the dollar were caused by European War. The sharp rise against after World War II is the devaluations of currencies and the rise in the dollar with Bretton Woods. The pattern for the dollar does not show a long-term bear market. This pattern is indicative of a market that has yet to peak. The greatest spike rallies in the dollar are war driven.
The rise in the British Pound to all time record highs against the US dollar took place also during the US Civil War. So to all those dollar haters who harp about money supply, the Fed, and just about everything else imaginable as to why the dollar should be worthless, the trump card is ALWAYS war.