Liberal feminism, also called mainstream feminism, is a main branch of feminism defined by its focus on achieving gender equality through political and legal reform within the framework of liberal democracy. As the oldest of the "Big Three" schools of feminist thought, liberal feminism has its roots in 19th century first-wave feminism that focused particularly on women's suffrage and access to education, and that was associated with 19th century liberalism and progressivism. Traditional liberal feminism has a strong focus on political and legal reforms aiming to give women equal rights and opportunities. Liberal feminists argue that society holds the false belief that women are, by nature, less intellectually and physically capable than men; thus it tends to discriminate against women in the academy, the forum, and the marketplace. Liberal feminists believe that "female subordination is rooted in a set of customary and legal constraints that blocks women's entrance to and success in the so-called public world", and strive for sexual equality via political and legal reform. Liberal feminism "works within the structure of mainstream society to integrate women into that structure."