This paper outlines the US e-commerce market, which has grown rapidly among them, as the size of e-commerce market is growing greatly due to the development of information and communication technology today. The United States has quickly established itself in the e-commerce market with the rapid dissemination of the Internet and electronic devices and the development of technology. In addition, the U.S. e-commerce market has the greatest advantage of having the largest number of online consumers in the world. This is because not only the population in the U.S. but also the influx of consumers who purchase from abroad is high. For these consumers, U.S. e-commerce companies are making efforts to build a more innovative delivery service to create an environment for faster delivery to consumers, and build mobile platforms as more consumers shop on mobile devices. Companies also want to provide consumers with more convenient services through omni-channels that can increase both online and offline accessibility. Amazon, a leading U.S. e-commerce company, is also expanding its reach beyond online to offline markets through Omni Channel, and Wal-Mart is also preparing for greater growth by establishing an e-commerce system to compete with Amazon. While more small and medium-sized enterprises are growing along with leading U.S. e-commerce companies, the U.S. should prepare strategies to cope with the growth of the Chinese e-commerce market as the Chinese e-commerce market has recently shown rapid growth.