Answer:
Political Geography: The Ottoman Empire has turned into a smaller country of Turkey, Germany was created from many small German states, and many new countries have formed.
Population: Since the 17th century, the population has grown a lot because of the discovered industry since then and have many organizations to keep peace, like the EU.
Religion: Many countries are more secular because religion is not as important anymore.
Immigration: more immigration because this is a place where people can live well and earn money, so people in places like Syria and Russia can move to Europe to live better, which means more immigration is happening.