What innovation do you think has had the most influence on expanding the american
economy? why?

It is reasonable to argue that the invention of the internet had the most influence on expanding American economy.

Explanation:

The internet had a significant effect on cost savings in many sectors of economy, that lowered the prices of products and services and thus increasing living standards and economic growth. It also increased management efficiency to manage companies supply chains more effectively, making transactions cheaper and quicker.

For example, online retail had a revolutionary impact on American economy. Thanks to online retail companies, such as Amazon, shopping has become much faster and easier on the customers side. Customers no longer have to spend time going to the shop, they can make quick purchases online and get their order delivered to the doorstep. On the other hand, online retail companies do not need to rent shopping spaces anymore, they rather need to build super efficient fulfillment centers.