2008 The U. S. announces that a section of the barrier had been mistakenly built from 1 to 6 feet (2 meters) inside Mexican territory and must be moved. Congress approves the Department of Homeland Security's right to circumvent more than 30 environmental laws in a push to get fencing constructed by year's end.
2009 The Great Recession kicks off the first outflow of Mexicans from the United States since the annexation of Texas, creating a net loss of illegals living in the U.S. The U.S. peak of 12 million illegal residents begins to decline at the rate of about 300,000 per year.
2010 The New York Times writes that over the previous four years, 51 unauthorized tunnels running under the border walls had been found in Nogales, Arizona, and Nogales, Sonora. They are mainly for drug trafficking, not emigration.
2011 The Department of Homeland Security completes 649 miles of barriers, including 350 miles of pedestrian fencing, at an estimated $6.5 million per mile, and 299 miles of vehicle barriers that cost approximately $1.7 million per mile. But $1 billion spent on a pilot program for "virtual surveillance" in Arizona yields only 53 miles of coverage. With the backing of the DHS, the Obama administration cuts funding for the rest of the hyper-expensive "virtual wall."
2012 The Washington Office on Latin America, a human rights organization, warns that the number of border crossing fatalities have doubled since the year before. The United States Border Patrol finds the remains of 463 people.
2013 U.S. Rep. Henry Cuellar (D-Texas) tells Forbes that there are plenty of ways to enter the U.S. illegally that don't involve walking across the border, says "a fence is a 14th-century solution to a 21st-century problem."
2014 Central and South America send massive numbers of refugees into Mexico heading north for the U.S. The number of non-Mexicans crossing the border illegally exceeds the number of Mexicans for the first time. A surge of unaccompanied children cross the U.S. border.
2015 Patrols report that 3,000 human remains have been found on the Arizona border since the wall's construction began. Human rights groups double that number, including the unfound and those on the Mexican side. "No More Deaths" leaves thousands of jugs of water in the desert for potential emigrants. Mexicans nail coffins with the Spanish word for "death" painted on them along the border wall.
2016 Pew Research reports that more people from the U.S. are going to Mexico than the other way around. Scott Walker, Wisconsin Governor, says that there are "legitimate concerns" about security along the country's 5,525-mile northern border, and that he would support building a wall between the U.S. and Canada.
2017 President Donald Trump renews his vow to build "a great, great wall" across the rest of the 2,000-mile border. Executive orders call for an increase of 5,000 border patrol agents and 10,000 Immigration and Customs Enforcement, or ICE, officers above the 21,000 already employed. In the United States, mothers and father are separated from children and deported.