They were forced to live in the Warsaw ghetto because Hitler did not like them and this was another type of concentration camp except here not as many people were killed and tortured
The Nazis ordered the Jews to move into the ghettos, having first thrown all non-Jews out of the area. There were drastic penalties for failure to move into a ghetto.
Jews were required to wear a large yellow Star of David on their chests, and also forced to live in separaate areas of the city ot town (called the ghetto).
They were evicted from their dwellings and told that they had housing in the ghettos. By 1941 any Jew not in a ghetto (or camp) in German controlled territory would most likely have been shot. (as that was easier than arranging transport to a ghetto, or camp)
Most survived. There was a ghetto but Jews didn't have to live there and it was not sealed off. At the time Shanghai was under Japanese occupation, and the Japanese were completely bewildered by European antisemitism.
The Warsaw ghetto was the largest ghetto established in Poland. the total of Jews that can be crowded in is about 450,000 Jews. They were crowded into an area of 1.4 square miles that was the Warsaw ghetto.
ghetto refers to portions of city's which were guarded and boarded up. Jews were taken there and forced to stay there in dire conditions before being transported to concentration camps