[Excerpt] The terrorist attacks of 2001 focused attention on the U.S.-Canadian border. Several bilateral initiatives have been undertaken to minimize disruption to commerce from added border security. The focus on the border has renewed interest in some quarters in greater economic integration, either through incremental measures such as greater regulatory cooperation or potentially larger goals such as a customs or monetary union. Congressional interest has focused mostly on trade disputes, and also on the ability of the two nations to continue their traditional volume of trade with heightened security on the border.