The correct answer to this open question is the following.
In each of the mentioned events, Dr. Martin Luther King, Jr. demonstrated his commitment to nonviolent demonstrations despite the local police's different aggressions.
The Montgomery bus boycott started on December 5, 1955, and ended on December 20, 1956. The March on Washington for Jobs and Freedom Alabama protests occurred on August 28, 1963, and approximately 250,000 participated in this historic demonstration.
Dr. King, Rosa Parks, and all the civil rights leaders who participated in both demonstrations resisted the police and other people's aggressions and maintained their commitment to never act violently. Indeed, it was the "trademark" of Dr. King's style.
Answer:
It should be Frederick Law Olmsted.
The civil war was caused by unfair tariffs, as seen when Andrew Jackson was in office, and South Carolina seceded from the U.S., because of said tariffs. Also another main cause (as we all know) slavery, but do not let anyone tell you! Even your teacher, that it was the sole cause of the civil war, because it was not. It was to preserve the Union, and protect the southern society.