L. Sprague deCamp 
Continent Makers and Other Tales of the Viagens [EPUB ebook] 

BEYOND 2001!By the twenty-first century, the great power struggle on Earth had been resolved in the only possible way. The United States, Russia, and China all have fallen by the wayside, and Brazil has assumed her rightful place as world leader. Thus it is naturally Brazil that conducts the first interstellar explorations, and creates the great space transport system, the Viagens Interplanetaries, to extend her galactic conquests and hold her vast and growing empire together.