Although the United States is a pluralistic society, made up of many groups, each with its own set of values, certain values dominate: achievement and success, individualism, hard work, efficiency and practicality, science and technology, material comfort, freedom, democracy, equality, group superiority, education, religiosity, and romantic love. Some values cluster together (value clusters) to form a larger whole. Value contradictions (such as equality, sexism, and racism) indicate areas of tension, which are likely points of social change. Leisure, self-fulfillment, physical fitness, youthfulness, and concern for the environment are emerging core values. Core values do not change without opposition.