Answer:
The Nazi party is believed to have been started around 1920, and ended in 1945 together with the Second World War.
Info:
Remember that asking for the end of "nazism" and "Nazi's" is different. Nazism can be considered as an ideology, a way of thinking, while the "Nazis" where actually just a political party in Germany (National-Socialist party).
Hope it helped,
BioTeacher101
