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

It wasn't openly talked about very much, in the sense that people said they wanted to beat GB at this or that, but there would however be sidelong comparisons frequently in press commentary. And it was also pretty quickly obvious that no other countries were developing the kind of technological depth of industry as were the US and the UK.

I think it was the occasion of the final psychological break with Great Britain, in a way that had clearly not happened to that date, especially in New England and to som degree in the South.

We demonstrated what you could do when a band of entrepreneurs settles an empty country with vast resources. The Chinese have a billion people and are running out of water. Tougher problem for sure.

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.

I would speculate that a critical mass of the population has to internalize a middle class outlook first. International aid experience has demonstrated many times that just building railroads doesn't get you there. You need people ready to sue them.

n truth, we don't know a whole lot of what Simeon North did. He did manage to match John Hall's ability to make interchangeable parts, but it's not clear how much of that came from Hall and how much was original with North.