The answers are:
1. a. Increasing opposition to the Vietnam War had sharply divided the country and turned public opinion against Johnson's presidency.
2. b. The Civil Rights Act of 1964 was a landmark civil rights and labor law that outlawed discrimination based on race, color, religion, sex, or national origin.
3. a. The Cold War and the Space Race with the Soviet Union caused the growth of the aerospace industry in Texas, centered around NASA's Johnson Space Center in Houston.
4. c. Texas cities grew rapidly in the late 20th century due to the availability of good jobs and a perceived high quality of life.
5. d. Low-cost housing programs did not contribute to Texas city growth.