Anti-discrimination law
The Civil Rights Act of 1964 was the first major development in anti-discrimination law in the US, though prior civil rights legislation (such as the Civil Rights Act of 1957) addressed some forms of discrimination, the Civil Rights Act of 1964 was much broader, providing protections for race, color, religion, sex, or national origin in the areas of voting, education, employment, and public accommodations. This landmark legislation led the way for other federal legislation, which expanded upon the protected classes and forms of discrimination prohibited under federal legislation, such as the Fair Housing Act or the Americans with Disabilities Act. These protections have also been expanded through the courts interpretation of these pieces of legislation. For example, the 7th and 2nd circuit courts have both ruled that employment discrimination based on sexual orientation is a violation of Title VII of the Civil Rights Act. In addition to federal legislation, there are numerous state and local laws that address discrimination that is not covered by these laws.
Employment discrimination law in the United States
Employment discrimination or harassment in the private sector is not unconstitutional because Federal and most State Constitutions do not expressly give their respective government the power to enact civil rights laws that apply to the private sector. The Federal government's authority to regulate a private business, including civil rights laws, stems from their power to regulate all commerce between the States. Some State Constitutions do expressly afford some protection from public and private employment discrimination, such as Article I of the California Constitution. However, most State Constitutions only address discriminatory treatment by the government, including a public employer.