*pulls European closer* The most populous countries in the world are China, India, the United States, Indonesia, Pakistan, Nigeria, and Brazil in that order, with these seven nations alone making up 48.16% of the world population. You may note with the aid of a map that many of these nations are quite large, and would take several days of travel to go across either in cars or on boats. Almost half of the world's population lives in places where you can travel in a cramped vehicle for days and still be within the country. Your worldview is limited and Europe is a tiny outlier in travel time and standards for international relations.