Answer: Rousseau was a writer/artist that spread the idea of the enlightenment, while Blake spread the idea of Romanticism.
Rousseau was more interested in reason, reality, and science, while Blake was more interested in freedom, feelings, passions, and nature. They both had completely different ideas and opinions, but both still made an impact because of how DIFFERENT they were and attracted different people with different opinions and beliefs
American colonists have used the words of Jefferson to defend their right to get independence from Great Britain.
Blacks affected by slavery and who faced discrimination because of their race have often reechoed Jefferson's words in their fight against discrimination. For example, Martin Luther King, Jr in his famous letter written from Birmingham City Jail included Jefferson's statements about "all men are created equal...".
Some right groups have also used Jefferson's words to gain equal treatment in society.