The Warsaw Ghetto was established on 2 October 1940 by the German occupying authorities for the people of the Mosaic faith. It is worth remembering that before the outbreak of World War II, Warsaw was the largest concentration of Jewish residents in Europe and the second largest in the world, just after New York. The ghetto was located in the north-western part of central Warsaw. Beginning in April 1940, the ghetto began to be separated from the rest of the city by a wall, until finally a closed district for Jews was obtained. The population density in the ghetto reached almost 1.5 million at its peak, which resulted in drastically deteriorating sanitary conditions, widespread hunger and epidemics of infectious diseases. Overpopulation while reducing food rations was part of the Nazi occupier's genocidal strategy. Between 1940 and 1942, nearly 100 000 people died as a result of famine and disease in the ghetto. The uprising broke out on 19 April 1943 and coincided with the eve of the Jewish holiday of Pesach. The Warsaw Ghetto Uprising was the first urban speech against the German occupier on the scale of the whole European continent. The insurgents had no military strategic objectives or any chance of success. This speech was symbolic in nature and was a response to the genocide committed by the Nazis. Today it is regarded as one of the most important events in the history of the Jewish people. The 70th anniversary of these painful events was celebrated in April and May 2013 in Warsaw under the honorary patronage of the President of the Republic of Poland, Bronisław Komorowski.