[["East German authorities began building the Berlin Wall on August 15, 1961 to stop the average 2000 persons that were escaping to the west daily.", 187.0], ["The Berlin Wall was\u00a0erected in 1961, because more than 2.6 million East Germans escaped to West\u00a0Berlin\u00a0or West Germany from 1949 to 1961 (total population of East Germany\u00a0was\u00a0about 17 million).", 173.0], ["The Berlin Wall was a guarded concrete barrier that physically and ideologically divided Berlin from 1961 to 1989. Construction of the wall was commenced by the German Democratic Republic on 13 August 1961. The Wall cut off West Berlin from surrounding East Germany, including East Berlin.", 50.0], ["August 13, 1961, the Communist government of the German Democratic Republic (or East Germany) began to build a barbed wire and concrete \u201cantifascist bulwark,\u201d between East & West Berlin, to prevent mass defections from East to West. The Berlin Wall stood until November 9, 1989.", 25.0]]
when did the berlin wall go up
history,berlin