Most Canadian citizens and many citizens from Visa Waiver Program countries can come to the United States (U.S.) without a visa if they meet certain requirements. The U.S. Department of Homeland Security website has helpful information for international visitors, including information on the Electronic System for Travel Authorization for those travellers who are eligible under the Visa Waiver Program.
You can also visit the U.S. Department of Homeland Security website to learn about requirements for nonimmigrant visas.
To request a letter of invitation to attend the ASSH Annual Meeting, please contact the ASSH Meetings Department at meetings@assh.org.