The most notable anomalous event if you zoom back to more like 1814 instead of 1914 is that ever since the US completely decoupled from the gold standard, it switched into purely inflationary mode rather than often bouncing back. From the 1800-1900 pretty much the entire time was spent at worst 1/2 to 2x the average value. Far less variance than after the introduction of federal reserve and taking off the gold standard, where purchasing power was destroyed to something like <1/10th of the century average.