Citizens of 38 countries can enter the United States for business purposes without a B-1 visa. In order to enter the United States without a visa, these citizens must file with the ESTA program online.
Electronic System for Travel Authorization (ESTA) is an automated system that determines the eligibility of visitors to travel to the United States under the Visa Waiver Program (VWP). Visitors, including entrepreneurs, travelling under the visa waiver program may enter the United States to partake in the same activities permitted under the B-1 visa. As with the B-1 it can be a good option for entrepreneurs to enter to U.S. to participate in business activities.