"In these challenging times, too many Americans face limited opportunities, but our capacity to support each other remains
limitless. Today, let us ask ourselves what Dr. King believed to be
life's most urgent and persistent question: 'What are you doing for
others?"

Based on this proclamation, explain how Americans supporting
each other could bring America closer to Dr. King's "promised
land" of equality and opportunity.

Support your answer with evidence from the text.

Supporting each other could bring America closer by accepting each other no matter any difference. Cherish each other and accept that we are equal and the same. The speech states "Only when our children are free to pursue their full measure of success-- unhindered by the color of their skin, their gender, the faith in their heart, the people they love or the fortune of their birth-- will we have reached our destination".  

Explanation:

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.

a case involving the laws of a single state.