What impact did transportation and communication have on america?

The impact of transportation and communication was a big step for America.

This has allowed to country to have an economy with large companies that take advantage of regional specialization.

For example the transportation system makes it possible for goods to be brought for any point in the country to any other point.

By the other hand the communications have allowed for larger companies to develop because the products because they can easily in touch with the suppliers and customers around the country.

chlorofluorocarbons are released via: aerosol sprays and refrigerants.

i think its the outcome of people's preferences.