 Their opponents emphasize what they see as the largely Christian heritage and history of the nation (often citing the references to "Nature's God" and the "Creator" of men in the Declaration of Independence and the dating of the Constitution with the phrase "in the Year of our Lord").Some more socially conservative Christian sects, such as the Christian Reconstructionist movement, oppose the concept of a "wall of separation" and prefer a closer relationship between church and state.Problems also arise in U.S. public schools concerning the teaching and display of religious issues.