The phrase of Jefferson (see above) was quoted by the United States Supreme Court first in 1878, and then in a series of cases starting in 1947. The Supreme Court did not consider the question of how this applied to the states until 1947; when they did, in "Everson v. Board of Education", the court incorporated the establishment clause, determining that it applied to the states and that a law enabling reimbursement for busing to all schools (including parochial schools) was constitutional.