Who started the war between Germany and the Jews, and when did it start? Good question! Most people think that Germany was to blame — the Jews were innocent victims who never did anything wrong.
An article which you can read here explains how it got started: http://altrighthistoryoftheus.weebly.com/world-war-ii.html
In 1933, shortly after Hitler first came to power in Germany, Jews around the globe declared economic warfare on Germany. Launching a global boycott of German made goods, Jews worldwide refused to sell any merchandise made in or imported from Germany in their stores. This retaliatory measure was adopted by Jews around the world as an attack against the Third Reich.
Hitler’s government was determined to wrest control of the German banking system, the media, and other professions out of the hands of Jewish Communists who hoped to lead a second Bolshevik Revolution, imposing Communism not only on Germany but on all of Western Europe, just as they had done less than two decades earlier in Czarist Russia.
Once Hitler came to power, he set about to remove Jews and other subversives from positions of influence, ordering the Jews to leave Germany, or else they would be rounded up and placed in labor camps and detention facilities to await deportation out of Germany.
While some Jews did choose to leave Germany, most refused and were placed in concentration camps. The camps built and run by the Germans were much like the camps operated by the United States in which Japanese Americans were confined following the bombing of Pearl Harbor. They were monitored by the International Red Cross and were operated in compliance with the terms of the 1929 Geneva Convention.