It would be very difficult to argue that one person/event can accurately summarize the huge political, social, and economic changes that took place during this era. One must consider that this time period saw the anti-war movement, civil rights movement, environmental movement, and parts of the women's rights movement. No one person or event involved all of these different changes at once.
However, if you were to make this argument you could use the following:
a) Martin Luther King Jr.- His role in the Civil Rights movement and peace movement make him one of the biggest civil rights icons of the 21st century.
b) March on Washington for Jobs and Freedom- This 1963 march included hundreds of thousands of Americans and allowed MLK to give his "I have a dream speech."
The mists allows a rain forest-like ecosystem adjacent to the falls and on the opposite cliff that faces them like a dried-up mirror image, thick with mahogany, fig, palm, and other species of vegetation.
In a general sense, it was because of the oppression that Britain had put over the colonies that led to the Declaration of Independence. Some of the many factors included tax impositions, the Boston Massacre, Coercive Acts, and Common Sense by Thomas Paine.
Moreover, the declaration was written by a committee of five including Thomas Jefferson (primary author), John Adams, Benjamin Franklin, Roger Sherman, and Robert Livingston and ratified on July 4, 1776 in Philadelphia.
