In 2008, women comprised 46.5% of the United States workforce and were responsible for a majority of workforce growth. Women in the workforce meet a significant number of challenges, one of which is pregnancy. Pregnant women may face workplace discrimination; however laws are in place to prevent such problems. In 1978, the Pregnancy Discrimination Act was signed into law. The Act is an amendment to the 1964 Civil Rights Act, and it protects women from discriminatory actions based on pregnancy and childbirth. According to the Pregnancy Discrimination Act, employers may not refuse to hire a pregnant woman due to her pregnancy. Additionally, if a woman becomes unable to do her job due to her pregnancy, the employee must treat her as a temporarily disabled employee.