The only countries in South America that share no border with Brazil are Ecuador and Chile.
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There are only two South American countries which does not share a border with Brazil. Those countries are Chile and Ecuador.
No. They are two separate countries. They share a border and both are in the continent of South America.
Among the countries in South America, Brazil, Colombia, and Guyana share borders with Venezuela. However, countries like Peru and Ecuador do not share a border with Venezuela. Therefore, any mention of Peru or Ecuador would indicate a country that does not share a border with Venezuela.
There are 14 countries that share a land border with the United States: Canada and Mexico are the only two countries that border the U.S. directly, while the other 12 countries are located in Central and South America.
The two southernmost countries of Latin America are Chile and Argentina. They both share a border along the southern tip of South America.
North America and South America share a land border with the United States.
Canada is in North America and does not share a border or any bodies of water with South America anywhere.
Botswana and South Africa share Namibia's eastern border.
The countries that share a border with Paraguay in South America include; Brazil, Argentina and Bolivia. These countries are all interconnected but you;d have to more specific as to what you mean by how they influence each other.