The Holocaust was the state-sponsored,systematic persecution and annihilation of European Jewry by Nazi Germany and its collaborators, between 1933 and 1945.
This was hatred against the Jews.There were violent riot towards the Jews.People who didn't like them started rumors which weren't true.Some laws was to separate Jews from other people.The Nazis destroyed shops own by Jews this shows how the didn't want them here or anywhere.
This camps was to imprison those who they thought should deserve to be there.Other camps were use for killing Jews and Roma these camps are called "Killing Centers".People who went there are just victims who the Nazis thought were evil.The Nazi would capture them and send them to the camps.
United States and the Holocaust
The United States knew about the Nazis targeting the Jews. So Jews had to seek refuge in the united states.Most of the immigrants were Jews that came from Europe.The US press did report on Nazis violence against Jews.