People can influence governmental policies by exercising their right to vote
Answer:
Throughout the 1780s and 1790s, Washington stated privately that he no longer wanted to be a slaveowner, that he did not want to buy and sell slaves or separate enslaved families, and that he supported a plan for gradual abolition in the United States. Yet, Washington did not always act on his antislavery principles.
I’m not sure if this is the answer you want, but from what I gathered, it looks like there had been lots of planning to boycott before this incident. Parks was an active member of this discussion and some think that her refusal to move was a challenge. When she was arrested, African American rights groups such as the NAACP took that as a chance to begin the boycott, which was organized by Martin Luther King Jr.