All series are on their own scale. This chart serves 1 purpose, to see change in the values relative to their own range, over time and thereby giving a visual way to see how they moved versus one another over time.
The chart is broken down by presidential terms. This chart does not imply that any one president caused or did something, it's simply a good way to get an idea of what was happening as the executive budget and current ideology has an impact on debt levels.
Beyond Technical Analysiseconomicsfederalreservepresidentterms

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