There was a great little program on Tv yesterday explaining that the US spent the years between WW1 and WW2 preparing for a war with Britain involving invading and seizing Canada and then other British possessions. It envisaged trench warfare on the scale of WW1 waged across canada with millions of men on either side. Hitler spoilt the plan by making himself more of an enemy than Britain. The program makers noted that what was unusual about this situation was not that the US planned for war, but that a rising world power achieved dominance over its predecessor without in the end the war being fought. But maybe it was not so strange, given that in reality Germany was the challenger for world supremacy facing the US.
Now the boot is on the other foot. It is the US scrabbling for resources to defend its position. Britain eventually had to give up the notion that the economy ran on autopilot simply because it made the rules and had the advantages. The US economic position is declining and with it its power to make the rules to suit itself. In the 1920s or so the US was expanding in wealth because of its natural advantages. Then it screwed up the financial structure and set the whole thing back, but eventually the background position reasserted itself. Now the background has turned against the US making the policy details all the more important. The US cannot just count on an inherent position to save it from loopy leaders.