Although Brown v. Board of Education established that the segregation of schools was unconstitutional, many white Southerners strongly resisted integration.
Explanation:
As On May 17, 1954, the Brown v. Board of Education established that the segregation of schools was unconstitutional, many southern stated disagreed with the government's decision and didn't want African Americans to have the same rights, and access to the same things, then it was the NAACP or National Association for the Advancement of Colored People the one that helped to make the law followed in all the states, fighting for their rights.
The statement that best describes Thoreau's views on petitioning the government to effect change might be this one: "government should be based on conscience and that citizens should cease associating with an unjust government.