The civil rights movement was a struggle struggle for social justice that took place mainly during the 1950s and 1960s for blacks to gain equal rights under the law in the United States. The Civil War had officially abolished slavery, but it didn’t end discrimination against blacks—they continued to endure the devastating effects of racism, especially in the South. By the mid-20th century, African Americans had had more than enough of prejudice and violence against them. They, along with many whites, mobilized and began an unprecedented fight for equality that spanned two decades.
The answer is Civil War. It was battled over the subject of national supremacy versus states' rights. It established that the national government was highest or supreme, its sovereignty or dominance derived directly from the people, and therefore the states could not legally separate from the Union.
Robert E. Lee. He became a cultural icon in the south and hailed as one of the greatest generals in the civil war.