The North American Invasive Species Forum developed out of the former Weeds Across Borders, which began in 2002 with a conference in Tucson, Arizona. Organized by FICMNEW, the partnership of United States federal agencies, the conference sought to address the problem of weeds from an expanded, continental perspective. It emphasized that because weeds do not abide by political boundaries, extended cooperation and new partnerships are necessary. The success of the first conference was thus translated into a biennial conference that strove to advance the formation of partnerships, sharing of information, and coordination of programs that transcend traditional jurisdictional borders. In following years, Weeds Across Borders conferences were held in Canada, Mexico, and the United States and attracted participants and presenters from across each nation.
The goal of the conference was to provide a forum for educating, sharing, and disseminating knowledge about weed management, regulatory issues, and concerns regarding weed dispersal across and between jurisdictional boundaries in Canada, Mexico, and the United States. Each conference was organized around an overall theme, but included presentations on a wide variety of topics and perspectives.
Past conference locations included: