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.
Paraguay.
Paraguay and Bolivia are both countries in South America. Bolivia is in the Andes on the northwest border of Paraguay. Paraguay is southeast of Bolivia, and is landlocked between Brazil and Argentina, which separates Paraguay and Uruguay.
French Guayana, Suriname, Guyana, Venezuela, Colombia, Peru, Bolivia, Paraguay, Argentina and Uruguay
Both of these countries are in Africa. The northern border of the Democratic Republic of Congo is farther north than the northernmost border of Paraguay.
The Republic of Paraguay is bordered by Argentina to its southern border. Towards is northwest is Bolivia, and to the east and northeast is Brazil.
In Paraguay, Asuncion is situated on Paraguay River's left bank near Argentina's border. This city is the capital of Paraguay, and it was founded in 1536.
Paraguay, Brazil, Uruguay, and Chile
10 countries border Brazil. In fact every country in South America except Chile and Ecuador share a border with the continents largest country.
When countries share a border, it is called a "land border" or a "physical border".
Uruguay Paraguay Argentina in South Border
Brazil shares its longest border with Bolivia.