The end of the Cuban Missile Crisis.
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They started to create more safety precautions. Airport security has been upgraded to extremes with scanners and xrays. Border security has also been emphasized on. The US has taken countless steps, alot of which are directed towards defence
If there is a higher tariff on British goods, then people would not want to buy their goods because the tax if too high. If they can get something else for a lower cost, such as good from American business then they would go and buy from those business. This protects them because again people like to get the most for their buck and this lessens competition from British business.
Machines made it easier to complete hard tasks(such as the cotton gin) and they also could get work done faster than humans, which lead to a much grander scale of production in goods. Hope this helps :D
