the primary purpose of the social contract is to expand Liberty
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I could add a fourth category that you could consider in your answer if you are allowed to do that.
Fourth: the leaders of the movement
In point of fact, all of them were effective. The Supreme court heard many cases on the right to vote and the right to be treated as though color were not a determining factor on voting rights. These cases helped bring about the Civil Rights act of 1964 and the Voting rights act of 1965. It put teeth into the 15th amendment, all of which you should look up.
Martin Luther King made a huge impact on Civil Rights. One of key ideas that he had was civil disobedience. Even that was strongly opposed by people like Governor George Wallace. That aside, civil disobedience was a method that peaceful people could tie into and participate in. Look up Rosa Parks as the primary example of someone very welling to stand her ground.
When you look up the Civil Rights act you will see that the Federal Government played a key role in making and enforcing key laws.
The people were ready to determine their rights as citizens. The time was right to unite the participants. Even students themselves were involved in "the people" many of whom were from many parts of the United States. You could google students civil rights movement. People your age were very influential.
Voices, thunderings
The reference you have in mind is from chapter 8 of the Revelation of Jesus Christ to John. Here's the section as quoted from the King James Version:
"Another angel came and stood at the altar, having a golden censer; and there was given unto him much incense, that he should offer it with the prayers of all saints upon the golden altar which was before the throne. And the smoke of the incense, which came with the prayers of the saints, ascended up before God out of the angel's hand. And the angel took the censer, and filled it with fire of the altar, and cast it into the earth: and there were voices, and thunderings, and lightnings, and an earthquake" (Revelation 8:3-5 KJV).
All these countries are part of the Commonwealth. The governments in each are all run on the same basis which is based on English system whereby the Prime Minister runs the affairs of the country instead of a President and with members of Parliament,