1. It was fortunate enough to discover large oil fields on its own soil during the same period when it had massive investment from Britain with which to develop the railways;
2. It was able to be a huge supply nation to European countries during the First World War — even to both sides (gun cotton) simultaneously in the early stages;
3. From its post-First World War years of prosperity and onwards it was able to recruit the cream of British and German scientific brains.
America is now three nations — social elite, white majority, African-American minority — with a fourth, Hispanics, well on the way. If Trump becomes President I wonder how he’ll restore America’s former greatness?