Brazil is the largest country in Latin America and the most powerful in economic, military, and political terms.
Brazil represents almost exactly 50% of the entire population of South America. By sheer size, no other country in the region could compete in absolute terms.
It accounts for more than 50% of South America's GDP, has by far the largest and most powerful army, is the largest market, is home to the largest and most cosmopolitan city in the southern hemisphere, has the most important industrial pole, is home to the dominant start-up industry, the largest financial industry, and . . .