In terms of transportation, the development of more advanced road networks, freight services, railways, and flight paths has simply made it easier to do business across great distances, thereby enhancing the economy. For example, 100 years ago, it may have been very challenging for a company in San Francisco to get affordable parts from a company in Florida. Nowadays, if these parts were needed urgently, they could be put on a plane, or, if the company wanted to utilize a more affordable option and had some time available, they could put the cargo onto a truck or train with very few complications.

When it comes to communication, the economy has been revolutionized by recent advances in digital technology. Think about how much more efficiently companies can conduct business nowadays with the help of email and online services. Any information that a company needs is now just the click of a button away thanks to the internet. Advances in communication technology have therefore greatly enhanced the economy of the United States.

Over time, the trend has been for the US to develop transportation and communications networks that have become ever more elaborate and extensive.  This has allowed the country to have an economy with large companies that take advantage of regional specialization.

The transportation system makes it possible for goods to be brought from any point in the country to any other point.  This allows certain regions to specialize in certain things because the products from those regions can be brought anywhere.

Communications have allowed for larger companies to develop because they can easily stay in touch with suppliers and customers around the country.

Today, the communications (internet) and transportation (shipping, trucks, and trains) has actually helped to create the economy we now have with so many imports coming from abroad.