Ill ARGENTINE Juan Diaz de Solis in 1508 discovered the Rio de la Plata, otherwise known as the River Plate, while searching for a southerly pas sage to the Pacific Ocean. In 1525 Sebastian Cabot entered the river and gave it the name it now bears, at the same time erecting a fort near its mouth. A wealthy Spaniard, Pedro de Mendoza, in 1536, in exchange for certain landed rights and governmental privileges, established what is now the present city of Buenos Aires. It is unnecessary for the purposes of this book to do more than state briefly that the con ditions imposed by Spain on all its colonies were outrageously unjust and caused much dis sension. Efforts to progress were throttled and the friction between the mother country developed until the conquest of Spain by Na- 31