Immigration, illegal immigration, and border security
There was a large change in the Trump Administration, particularly in the Justice Department, concerning immigration policy, compared to the Obama Administration.[68] According to data released early in Trump's presidency, illegal border crossings decreased by 40% in the first month of Trump's presidency – a remarkable achievement, considering that illegal immigration usually increases by 10 to 20% in January and February.[69][70] In March, illegal immigration had fallen by over 60%.[71] It was reported in April that illegal immigration levels had fallen to the lowest point in 17 years.[72] In six months, the illegal immigration of Haitians, specifically, into the U.S. declined by 97%.[73] Illegal immigration dropped so much that U.S. Customs and Border Protection was able to close on of their temporary holding facilities.[74] This drop was probably due to the Trump effect.[75][76]
President Trump worked to eliminate Obama's legacy of giving privileges to illegal immigrants in detention centers.[77] At the same time, the Trump Administration expanded immigration enforcement efforts, such as through building additional detention centers.[78]
http://www.conservapedia.com/Donald_Trump_achievements#Immigration.2C_illegal_immigration.2C_and_border_security