Over the last few decades, there have been three competing views of the meaning of the Establishment Clause held by members of the Supreme Court. One, favored by the liberal justices, is that the Establishment Clause should be understood as creating a wall separating church and state. An alternative view, favored by the conservative justices, is that there should be “accommodation” between religion and government. Under this view, the government violates the Establishment Clause only if it creates a church, coerces religious participation, or discriminates among religions in giving financial benefits. A third position is that the government acts unconstitutionally if it endorses religion or a specific religion. The chapter argues that separation is the best view of the Establishment Clause and applies this to prayers at government activities, religious symbols on government property, and government aid to religious institutions.