Image taken on Dec. 14, 2013 shows citizens on both sides of the border between Mexico and the United States celebrating the 20th edition "Borderless Posada" in Tijuana city, Mexico. On Jan. 25, 2017, U.S. President Donald Trump signed an executive order for a border wall to be built, but Center for Latin American Monetary Studies (CEMLA) estimated that migration from Mexico has been slowing down since 2008 after growing from 1990 to its peak in 2007. (Xinhua/Guillermo Arias)