A pardon is an application to remove your Canadian criminal record from all searchable systems. A Waiver is an application to the United States of America for permission to re-enter the US if you have been denied entry for any reason.
Unfortunately, the Unites States does not recognize a pardon, so you will also need to obtain a U.S. Entry Waiver if you wish to enter the U.S. after having been denied entry.
If the U.S. is not yet aware of your criminal record, you might choose to only apply for a pardon, as the U.S. cannot subsequently access your criminal record. However, the United States does not condone this practice and considers it an attempt to circumvent their laws. Express Pardons recommends applying for both a pardon and a waiver if you wish to enter the United States with a criminal record. However, the choice is yours to make.
For more information see Waiver FAQ
