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.
Attack from outside forces
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Answer:
The Boston Tea Party made Britian more hostile towards the reality of an american indepedance movement and americans became more hopeful for a revolution.
Explanation:
The Stamp Act furthered these tyrannical ideas upon the colonists.
Answer:
C
Explanation:
It started in Europe which spread to new countries like the U.S but the south had good weather conditions for agriculture.