Conservatism in North America is a political philosophy that varies in form, depending on the country and the region, but that has similar themes and goals. Academic study into the differences and similarities between conservatism in North American countries has been undertaken on numerous occasions. Reginald Bibby has asserted that the primary reason that conservatism has been so strong and enduring throughout North America is because of the propagation of religious values from generation to generation. This connection is strongest in mainstream Protestantism in the United States and both Protestantism and Roman Catholicism in Canada.