Answer:
No major genocides occurred during the 1950s and 1960s.
Step-by-step explanation:
In the given timeline of the major genocides, the major events occurred during the first half of the 20th century. This was then followed by some years of rest which then again revealed the occurrence of such genocides from 1975 onwards, but mostly outside of Europe.
The longest duration of such genocides is the holocaust where millions of Jews were killed under the regime of Adolf Hitler. But this is not to say that the other genocides are less damaging or horrendous.
Based on the information presented in the timeline, we can make the generalization that no major genocide occurred during the 1950s and 1960s.