Why did Kennedy say he was from Berlin?

In late June, 1963, then US President Kennedy visited West Berlin. At the height of the Cold War, the Berlin Wall was regarded as a symbol of the Cold War, so Kennedy wanted to see this wall. When East Germany 196 1 hastily built this wall in August, it claimed that it was to "prevent western spies and fascists from mixing into East Germany", but in fact it was to prevent East German residents, including skilled workers, from flowing into West Germany. 1962 August 2007 17, Peter Fechter, an East German, aged 18, was shot and killed by East German soldiers when he tried to escape to West Germany over the fence. At that time, western public opinion criticized their government for not taking tough measures to build the Berlin Wall in East Germany. On June 26th, Kennedy visited checkpoint Charlie, the most famous checkpoint in the Berlin Wall. This is the only passage for foreigners and allied officers and soldiers to enter East Berlin, and it is also considered as the "frontier of the Cold War". Just two months after the Berlin Wall was built, a great crisis happened here. At that time, an American diplomat wanted to go to the opera in East Berlin, and the East German soldiers wanted to check his papers, but the diplomat didn't agree. This incident triggered a military confrontation between the United States and the Soviet Union. Both sides dispatched 10 tanks, eyeing up at the Charlie checkpoint across 100 meters. The incident was quickly resolved through negotiations. At that time, the American representative was Robert Kennedy, the younger brother of President Kennedy, and the Soviet side was a KGB spy. After returning from the checkpoint, Kennedy delivered that famous speech to 450,000 people in the West Berlin City Hall Square. He said, "More than two thousand years ago, the proudest thing people said was' I am a Roman citizen'. Today, in this free world, the proudest sentence is' ichbineinberliner' (I come from Berlin) ... all free people, no matter where they live, are citizens of Berlin. Therefore, as a free man, I am also proud of' I am from Berlin'! " Kennedy's speech was delivered in English, and an interpreter translated it into German on the spot. However, when he said "I'm from Berlin" for the second time, it was in German, and the enthusiasm of the 450,000 audience at the scene was immediately ignited, with applause and cheers. Seeing the reaction of the audience, Kennedy adjusted his suit and grinned like a boy who had completed a great task.