Final answer:
The Civil Rights Act of 1964 was signed by Lyndon Johnson and prohibited discrimination based on race.
Step-by-step explanation:
The act that Lyndon Johnson signed in 1964, prohibiting discrimination based on race, was the Civil Rights Act. This act was a landmark piece of legislation that aimed to end segregation and ensure equal rights for all Americans. It was a direct result of the non-violent protests and activism carried out by groups like the NAACP, the SCLC, the SNCC, and CORE.
Learn more about The Civil Rights Act of 1964