Because they have a high degree of free markets and foreign investors
Bolivia is bordered by Peru, Brazil, Chile, Argentina and Paraguay. In the related links box below I posted one with the map of South America so you can compare.
It really depends on what commonalities are you basing your question from. For example: Both countries are federal republics, so countries similar to them would be Austria, India, Nigeria, Russia or Nepal. Both countries are on the Americas, so Argentina, Brazil and Chile would also be on the same group. Both countries have a large Hispanic population, so again, Argentina, Brazil and Chile would be similar to them.
Yes is about 8.514.876 kilometers square
No, Argentina is not a peninsula. Argentina to the west is Chile which blocks Argentina from the Pacific ocean. Therefore Argentina has water on the east facing the Atlantic ocean and a bit south. So no Argentina is not a peninsula.
The Patagonia region is shared between Argentina and Chile, so they will most likely use whatever currency they use in Argentina, or in Chile, depending on what part of Patagonia you are talking about.
Brazil is to the north and northeast of Uruguay, so from some northern parts of Uruguay travelling east would bring you Brazil. To the east of most of Uruguay is the Atlantic Ocean. If you kept going east you would pass south of South Africa and on towards Australia.
Since Brazil has no true deserts, it would have no 'desert grass.' Argentina has deserts so it would be more common there.
Who said so?, Chile is a Republic, perhaps the beginning of Chile as a Republic was through a Federal coalition between Chile, Argentina, Peru and Bolivia just to liberate our self's from Spain. The only way to federalism in Chile and in South America will be if the ABC (Argentina, Bolivia, Chile and Peru, get together and work together in the development, pursue and achievement of the American Dream.
Peru, Ecuador, Argentina, Chile, Brazil, Uruguay, Paraguay, Venezuela, Bolivia, because they are many multi cultural and have many tourists attractions and so many things you can do. With the most beautiful women in the world.
your question is like where is Canada-USA so they are both countries from south America
Patagonia is not a country. It is an area that is partly in Chile and partly in Argentina. So there are two currencies in use in it. The currency of Argentina is the Argentinian Peso and the currency of Chile is the Chilean Peso.
from what i have researched so far Argentina doesn't have any allies