The Social Gospel was a movement in Protestantism that applied Christian ethics to social problems, especially issues of social justice such as economic inequality, poverty, alcoholism, crime, racial tensions, slums, unclean environment, child labor, lack of unionization, poor schools, and the dangers of war. It was most prominent in the early-20th-century United States and Canada. Theologically, the Social Gospelers sought to put into practice the Lord's Prayer (Matthew 6:10): "Thy kingdom come, Thy will be done on earth as it is in heaven".