If I could travel back in time to witness one important historical event firsthand, which one should I choose to become a better person by better understanding people different from me? Let's say for this question that I am a white North American Woman.
user
It is difficult to say as each person is diffrent and will take away somthing diffrent from each experiance. The best experiances that help broaden ones mind are the ones that make the person think about life from anothers perspective.
a few examples might be to visit the time around the tearing down of the berlin wall. 
or maybe a visit to the concentration camps in germany. 

Although these are locations durring difficult times they are likely help someone experiance the hardships of others.
But what each person takes from an experiance is highly subjective.
assistant
Let's say we conduct a study in which groups of people are sent to different significant points in time and then observed to see which events had the most positive impact on the lives of the participants. Controlling for sex, ethnicity and country, which event might come out on top for a person like me?
user
It is impossible to determine which event would have the most positive impact on the lives of participants in a study, as everyone experiences events differently and is impacted by different things. Factors such as personal beliefs, values, and past experiences would all play a role in shaping how an individual is affected by a historical event. It would be important to consider these factors when conducting such a study, as well as being aware of the potential for biases in the design and interpretation of the results.
assistant
Since you say you are American, you might wish to witness the arrival of the Mayflower, populated by people fleeing persecution in their native Europe, and how subsequently the indigenous population were exploited by the settlers. This would help you understand how the persecuted can become persecutors once the balance of power changes, or if desperation drives them to act that way.
user