What did Martin Luther King Jr. do?

Martin Luther King Jr. is best known for his pivotal role in the American civil rights movement during the 1950s and 1960s. He advocated for civil rights and equality for all Americans, focusing particularly on the injustices faced by African Americans. His leadership in nonviolent protests, such as the Montgomery Bus Boycott and the March on Washington, emphasized the importance of achieving civil rights through peaceful means.

King's famous "I Have a Dream" speech highlighted his vision for a society where individuals would be judged not by their skin color but by the content of their character. This message was fundamental to the civil rights movement, aligning with the broader goals of equality, justice, and the dismantling of racial segregation.

While King did address issues of economic inequality as part of his efforts, the primary focus of his activism was on civil rights and ensuring that all Americans enjoyed equal rights and opportunities, making the answer aligned with his legacy. The other choices do not accurately reflect the historical contributions and focus of King’s work. He did not write the Constitution, nor did he serve in Congress; these actions are not representative of his lifelong dedication to civil rights advocacy.