Nazis thought that killing jewish people, roma, and other groups would

The correct answer is: "purify the German race".

Since the nazi party arrived to the German goverment, they started to enact discriminative laws against Jews. First of all, they forced Jews to differentiate themselves from other citizens by wearing a star. Afterwards, Jews were forced to live in ghettos (separated areas in cities).

Finally, as part of the policy called 'Final Solution to the Jewish Question', Jews started to be deported to either concentration camps where they were forced to hard laboruntil death, or to extermination camps were they were automatically killed.

Jews were regarded as second class citizens that were mixing with the supreme German race and spoiling it. Jews had also been blamed by Hitler for all the penalties that the German population had suffered in the former decades: losing the war, destruction, economic crisis, hunger, etc.

euruxeudduducududuf