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That is subjective and varies from person to person. Some may find scientific discoveries, historical events, or personal experiences to be the most interesting.
The Taj Mahal is most definetly a historical event
which historical event most likely had the biggest effect on the writings of W.E.B. DuBois
You are really stupid!
There are many historical events, but the one that stands out the most is the signing of the Declaration of Independence.
Most promenently the Vietnam war.
medicare
independence
gluten
The main criteria is if an event in the most recent war helped the victors win, things about the losers are generally not considered historical.
Most people find it interesting to know something about what happened in prehistoric times, before people started keeping historical records. But if prehistory does not interest you, don't study it.
American colonies' break from British rule