The drive to scale in almost every endeavor. The British went very large scale in ship building and a few other industries. Their steel plants were bigger and much more advanced than ours after the Civil War, but we had blown past them by the mid-80s.

Whitney proved to be a competent manufacturer, but wasn't an original inventor to any important degree. Thomas Blanchard was a true genius: his stock making machine was the daddy of all the industrial profiling machinery, like the 1870s universal milling machine, that was the especial American contribution to machining technology. By that time, the British conceded that machinery innovation had shifted to America.

My neck is too arthritic to snap around. The big shift in my perspective that happened in the writing process, however, was the paramount importance of the "West" epitomized by Cincinnati.

Military power tends to be a function of economic power, and the British Navy was the essential capability for establishing the imperial sway - which was attuned to furnish the raw materials for the British manufacturing ascendance. So they were mutually reinforcing.

merica was middle-class for the very start - the people who came first were hyper-strivers from England. There were no vested interests, no ranks, no classes, it was very lightly populated, there were unlimited natural resources - for free essentially - if you failed, you could always start over.

No specific technology. My guess is that it was the instinct always to go to maximum scale. Great Britain kept much more of a small shop mindset well into the twentieth century, for instance.

The Transcontinental Railroad Act is the first step in creating a continental common market.