Home / Blogs / U.S. closes world’s busiest border crossing as migrants approach U.S. closes world’s busiest border crossing as migrants approach Dea. Ron Gray Sr. · Monday, November 26th 2018 at 3:51AM · 527 views U.S. closes world’s busiest border crossing as migrants approach The United States closes the world’s busiest border in Southern Californian after migrants approached the border crossing earlier. About the Author Dea. Ron Gray Sr. Chicago, IL Posts Subscribe Profile Email Report