Presbyterian churches derive their name from the presbyterian form of church government, which is governed by representative assemblies of elders. A great number of Reformed churches are organized this way, but the word Presbyterian, when capitalized, is often applied uniquely to churches that trace their roots to the Church of Scotland, as well as several English dissenter groups that formed during the English Civil War. Presbyterian theology typically emphasizes the sovereignty of God, the authority of the Scriptures, and the necessity of grace through faith in Christ. Presbyterian church government was ensured in Scotland by the Acts of Union in 1707, which created the Kingdom of Great Britain. In fact, most Presbyterians found in England can trace a Scottish connection, and the Presbyterian denomination was also taken to North America, mostly by Scots and Scots-Irish immigrants. The Presbyterian denominations in Scotland hold to the Reformed theology of John Calvin and his immediate successors, although there is a range of theological views within contemporary Presbyterianism. Local congregations of churches which use presbyterian polity are governed by sessions made up of representatives of the congregation (elders); a conciliar approach which is found at other levels of decision-making (presbytery, synod and general assembly).