The Vice-royauté of Río of Plata was created in 1776 on order of the king Charles III of Spain, with an aim of improving defense of the Spanish colonies of South America and of better protecting the great transportation routes which drained the richnesses of the latter from Peru to the Atlantic Ocean in direction of Spain.
Pedro de Cevallos was charged by the crown with creation with the viceroyalty with Río with Plata, having its seat with Buenos Aires, this why it accepted the royal promise to pay has San Ildefonso on August 1st 1776. Was sent it to obtain satisfaction of the Portuguese for the insults made in Río of Plata . That stated clearly that the administration of the new entity would be definitely military. And indeed, the first act of the new viceroy was the attack which wanted to be decisive against the Portuguese establishment of Colonia LED built Sacramento, in violation of the Traité of Tordesillas, on the current territory of the Uruguay, vis-a-vis Buenos Aires.
The viceroyalty included/understood the territories which belong today to the Argentine, the Uruguay, the Paraguay, the Bolivia, and partially with the Chile and the south of the Brésil.
It should be noted that most of the territory of the viceroyalty remained unsubdued until second half of the XIXe century, as the chart published at the beginning of article shows it:
See also: History of Argentine#Des not subjected natives remained, History of Argentina: not subjected natives remained
These territories depended on the Vice-royauté of Peru. However this one had an enormous extension and the communications (through the Andes cordillera in particular) there was extremely slow at the time. So serious events occurred in area platéenne, it was necessary weeks so that the viceroy of Lima is informed by it and can react to it. On the other hand Buenos Aires was surrounded by vast plains which facilitated the speed of the mails enormously.
King Charles had made a rational decision by gathering in the same entity all the areas of the empire located in the basin of the Paraná. The fact of having left Chile within the administration of Lima proceeded of the same logic, because the communications with Peru, along the coasts of the Pacific Ocean, were fast, much faster there than with the close pampa whose Chile was cut by the Cordillera. With that the problem of the snow was added which blocked the collars in winter.
Other pressing reasons contributed to convince Charles III to decide this separation of with Peru:
Francisco Javier de Elío tried to be recognized by the municipal authorities of Buenos Aires, which refusérent its authority. It thus settled with Montevideo.
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