The main purpose of this legislation is to allow certain states, specifically those bordering Canada and Mexico, to place temporary structures on federal land to help secure the U.S. international borders. This is aimed at addressing issues related to illegal crossings and enhancing border security. Key provisions of the legislation include the authorization for border states to place movable, temporary structures on federal land without needing a special permit, as long as they notify the relevant federal authorities at least 45 days in advance.