Studies indicate that there was a four-year study of religious discrimination around the world and that Christians were the most discriminated group, experiencing harassment from the government and the company in 168 countries. Muslims make up the second largest religious population in the world and were discriminated against in 121 countries around the world between 2006 and 2010. Jews are the third largest religion discriminated against, although they only make up one percent of the population (11 facts). . Non-discrimination is a fundamental principle of human rights (Nygren). Gender discrimination is also beginning to be a problem in the United States. Sex discrimination is treating someone unfavorably because of their sex (gender-based). For sex discrimination to be illegal, it must involve different treatment that adversely affects the terms or conditions of employment (sex discrimination). In the United States, women struggle and face sexual discrimination.