Nazis built extermination camps equipped with huge gas chambers that could kill as many as 6000 human beings in a day. Those labeled as weak would die. They were told to undress for a shower and then led into a chamber with fake shower heads. After the doors were closed, cyanide gas poured from the shower heads. All inside were killed in a matter of minutes.
The Office of Strategic Services (OSS) was a wartime intelligence agency of the United States during World War II, and a predecessor of the modern Central Intelligence Agency (CIA). hope it helps.
The answer for this question could be 4 million because people started to go to schools so they could get jobs and earn money to pay for things they needed back then
