Protestant Reformation
Catholic countries such as Spain and Italy for a long time didn't allow Protestants to live there, and Protestant countries kept out Catholics. With the American Revolution the idea of freedom of religion began to expand. Protestants are influential in the United States and the English Canada. Quebec was a (formerly French) Catholic province of Canada. After the Seven Years War the British imposed the Quebec Act  granting freedom of religion in Quebec, while including in Quebec some of the present day United States, for example Ohio and Michigan. Catholics were granted religious freedom in those areas. Protestant colonists saw this as one of the Intolerable Acts. In later centuries, many Protestant churches were established in the province of Quebec. Many Catholic churches began in Ohio and Michigan. Eventually most Christian countries allowed some religious freedom.