Is it possible to reignite a sense of unity among Americans today?

How should we go about doing so? What would have to happen for the majority of the left and the majority of the right (with exceptions for extremism on both ends) to see each other as friends rather than opposition?

How do we encourage civil discourse?

How can we change the “us vs them” “left vs right” “conservatives vs liberals” mentality that appears so pervasive in our current culture?

Is it necessary? Why or why not?