Final answer:
President Lyndon B. Johnson is believed to have said "we have lost the South for a generation" after signing the Civil Rights Act of 1964, which was a pivotal law in the civil rights movement.
Step-by-step explanation:
President Lyndon B. Johnson reportedly said "we have lost the South for a generation" after signing the Civil Rights Act of 1964. This landmark legislation is viewed as one of the most important achievements of the civil rights era, as it prohibited discrimination in public accommodations, housing, and jobs based on race, religion, national origin, and gender. It also granted new powers to the federal government to enforce the act's provisions, which were key in advancing the rights of African Americans and other minorities during a turbulent time in American history.