I think what's common between the three is that, these are the turning points where human minds brought about change out of necessity. The ages before those mentioned are periods of great depressions and unfortunate event. So, these fueled the people to change for the better and appreciate science and art more.
The correct answer to this open question is the following.
Potential benefits of growing up in a Communistic society.
-Great educational system. Communist is characterized for having an excellent school system.
-Education is free in Communist systems.
-Excellent public health system. And it is also free.
-Communism can create a kind of equality in a society that is totally the opposite of de inequality created in Capitalist systems.
-Great physical education development that forges true sports competitors, as it has been seen in the Olympic Games.
Potential downsides.
-People cannot own property.
-It limits your aspirations to grow and prosper. Under communism, every individual has the same.
-There is no entrepreneurship spirit.
-The state owns the means of production, and dictates what to produce, when to produce, and at what price.
-Generally speaking, there is no freedom of speech in Communist systems.
