Columbia
Mexico is the Spanish speaking country that borders the US to the south.
Mexico borders the US to the south.
The Spanish-speaking country east of Colombia is Venezuela.
Venezuela is a Spanish-speaking country that is a member of OPEC (Organization of the Petroleum Exporting Countries).
The US states that border Spanish-speaking countries are California, Arizona, New Mexico, and Texas. These states share borders with Mexico.
Mexico borders the US to the south.
As an official language; yes.
Mexico is the Spanish speaking country that borders the US to the south.
Assuming that by "Spanish speaking country" you mean a country where Spanish is the official language, Cuba is the closest to Florida.
Venezuela is a country in and of itself. Originally a colony of the Empire of Spain, Venezuela is predominantly a Spanish-speaking nation.
Spanish is the language in Venezuela. It begins with the letter V.
Spain. It is the only country that borders Portugal.
Guatemala is directly south of Mexico and they speak Spanish there.
Venezuela, whose name means Little Venice.
Venezuela is a Spanish-speaking country that is a member of OPEC (Organization of the Petroleum Exporting Countries).
Texas, New Mexico, Arizona, and California all share a border with Mexico, the only Spanish-speaking country that borders the US.
I may be wrong, but I think that Venezuela is the largest spanish speaking country in south america.