The main idea here is identifying two milestones that truly shifted the U.S. Civil Rights Movement by changing both legal doctrine and everyday protections. A Supreme Court decision holding that segregated public schools are unconstitutional was a pivotal moment because it rejected the legal basis for separate education and sparked nationwide desegregation efforts, challenging the long-standing “separate but equal” standard. The other milestone is a broad federal law that bans discrimination based on race, color, religion, sex, or national origin in public accommodations and employment, with strong enforcement powers for the federal government. Together, these two events mark a major turning point: a judicial ruling that dismantled legalized segregation and a federal statute that codified protections and enforcement, pushing civil rights into everyday life nationwide. The other options blend unrelated eras or topics, so they don’t reflect this decisive shift in both judicial precedent and federal policy.