You’ll need prior authorisation to enter the United States using a passport. First thing you can do is to see if you qualify for the Electronic System for Travel Authorisation (ESTA) under the Visa Waiver Program.
The Visa Waiver Program allows passport holders from 38 countries to visit the U.S. for up to 90 days without a Visa. The types of travel allowed under the VWP include tourism, certain types of business visits and transit to another country. Learn more and apply online here: cbp.gov/travel.