Answer:
e-commerce turn the service industry to be the most dominant In united states economy.
Step-by-step explanation:
Before e-commerce was popular, the manufacturing companies contributed the largest amount of money to US economy. So the economy is basically controlled by a lot of relatively small manufacturing companies.
E-commerce was becoming popular after American consumer's desire convenience on top of the quality of the product. E-commerce allow the consumers to do their daily consumption with significantly lower effort.
For examples, You don't have to spend time to drive your car to the store to purchase things, can exclusively compared the products without moving from store to store, etc. Companies who offered this convince basically can be considered as a service company rather than manufacturing company.
Companies such as amazon that provided convenience for online shopping, Facebbook / twitter that can be used to seek product review, or postdates that can be used as a delivery service are operating under the service industry.