Anti-discrimination law at national level?
The 14th amendment to the US constitution guarantees equal protection under the law to all people: “"No state shall . . . deprive any person of life, liberty or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws."
Furthermore, a large number of anti-discrimination laws work in concert to provide a wide base for protection from discrimination in the US. Examples of these include but are not limited to:
-Civil Rights Acts of 1866, 1871, 1957, 1964, 1968, 1991
-Employment Non-Discrimination Act
-Equal Pay Act of 1963
-Age Discrimination Act of 1975
-Americans with Disabilities Act
That said, a significant amount of discrimination still exists in regards to the treatment of women (unequal pay and discrimination in the work place; gender-based violence and harassment) and minorities such as African Americans, Hispanics, and Native Americans (discrimination from employers; unequal and unfair treatment by law enforcement and in the judicial system leading to relatively high incarceration rates). While these groups technically have equal protection under the law, they tend to suffer from many of social and economic problems that result from long-term bias and discrimination, such as disproportionately high rates of poverty, infant mortality, unemployment, and low high school completion rates.
Undocumented immigrants are legally protected against discrimination on the basis of race or nationality, by employers or anyone else. That said, these rights are often violated because employers know the workers don't want to reveal their undocumented status, or undocumented workers are not aware of their rights. Furthermore, undocumented immigrants often face stigmatization, fear of deportation, lack of access to social services, and unjust treatment in informal work environments.
(http://immigration.lawyers.com/general-immigration/legal-rights-of-illegal-immigrants.html)
