TO GO WITH AFP STORY by Audrey KAUFFMANN and PACKAGE "Germany-east-History-20years" FILES - West Berliners crowd in front of the Berlin Wall early 11 November 1989 as they watch East German border guards demolishing a section of the wall in order to open a new crossing point between East and West Berlin, near the Potsdamer Square. Two days before, Gunter Schabowski, the East Berlin Communist party boss, declared that starting from midnight, East Germans would be free to leave the country, without permission, at any point along the border, including the crossing-points through the Wall in Berlin. The Berlin concrete wall was built by the East German government in August 1961 to seal off East Berlin from the part of the city occupied by the three main Western powers to prevent mass illegal immigration to the West. According to the "August 13 Association" which specialises in the history of the Berlin Wall, at least 938 people - 255 in Berlin alone - died, shot by East German border guards, attempting to flee to West Berlin or West Germany. AFP PHOTO / GERARD MALIE (Photo credit should read GERARD MALIE/AFP/Getty Images)
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What history tells us about Trump's wall
The world has a lot of famous border walls. CNN looks at how they compare to President Donald Trump's proposed US-Mexico wall.
01:22 - Source: CNN
Trump's border wall 16 videos
TO GO WITH AFP STORY by Audrey KAUFFMANN and PACKAGE "Germany-east-History-20years" FILES - West Berliners crowd in front of the Berlin Wall early 11 November 1989 as they watch East German border guards demolishing a section of the wall in order to open a new crossing point between East and West Berlin, near the Potsdamer Square. Two days before, Gunter Schabowski, the East Berlin Communist party boss, declared that starting from midnight, East Germans would be free to leave the country, without permission, at any point along the border, including the crossing-points through the Wall in Berlin. The Berlin concrete wall was built by the East German government in August 1961 to seal off East Berlin from the part of the city occupied by the three main Western powers to prevent mass illegal immigration to the West. According to the "August 13 Association" which specialises in the history of the Berlin Wall, at least 938 people - 255 in Berlin alone - died, shot by East German border guards, attempting to flee to West Berlin or West Germany. AFP PHOTO / GERARD MALIE (Photo credit should read GERARD MALIE/AFP/Getty Images)
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What history tells us about Trump's wall
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This image ran with Sen. Ted Cruz's tweet about the EL CHAPO Act.
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US President Donald Trump (C) is shown border wall prototypes in San Diego, California on March 13, 2018. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
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Trump's military guard may face legal hurdles
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A member of the Arizona National Guard talks on the phone on April 9, 2018 at the Papago Park Military Reservation in Phoenix. Arizona deployed its first 225 National Guard members to the Mexican border on Monday after President Donald Trump ordered thousands of troops to the frontier region to combat drug trafficking and illegal immigration. "The Arizona National Guard will deploy 225 members of the Guard today to support border security measures," the state militia said in a statement. / AFP PHOTO / Caitlin O'Hara (Photo credit should read CAITLIN O'HARA/AFP/Getty Images)
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Here's what border troops are actually doing
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