Did all the spanish speaking countries originally speak spanish?
Did all the spanish speaking countries originally speak spanish, or did they "adopt" the language while Spain controled them? 
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7 Answers
Originally? How far in time do you call "originally"? In Spain, before Spanish there was Gothic, Arabic, vulgar Latin,... and before that you had Basque, Iberian Celtic, Tartessian, Phoenician,...
In all the Latin American countries there were countless languages before Spanish, many of them still in use. In Mexico alone, you had entire families of languages: Mayan, Uto-Aztecan (eg. Nahuatl), Algonquian, Manguean,... In South America there were probably over 1500 languages before Columbus arrived.
It depends on what you mean.
Most of the American countries (central and south) were Spanish speaking at the time of their independence from Spain, but before the Spanish colonized those areas in the last 500 years or so, indigenous groups such as the Incans, the Olmecs, the Mayans, the Aztecs, and others had each their own languages.
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None of the Spanish-speaking countries originally spoke Spanish. Prior to the conquest and colonization of the New World, there were many different indigenous groups in Latin America and many different languages were spoken. Spain itself is where Spanish originated, but prior to Spanish there was Latin, which was another language imposed on the peninsula. There were foreign languages spoken on the peninsula in ancient history such as Phoenecian and Greek. There were also native languages there, few of which remain to this day. Basque is one of the few remaining native languages in Spain, and its origin is unknown.
Just to give you an idea -
Bolivia has about 30 indigenous "peoples" who were here before the Spanish arrived.
Today they still speak about 30 different languages - the main ones are Aymara - Quechua and Guarani. Spanish is the "universal" language here.
I am sure that if we go far enough back in time, we get to a point where everyone spoke some variant of your basic "grunt", "eek", "ungawa!!".
So yes, just about how long ago are we talking about?
No....if you go back far enough, none of the Spanish speaking countries originally spoke Spanish, including the area that is now called Spain.
If you are interested in the history of the Spanish language you might find this article to be a good starting point: History of Spanish
None of the countries in the Americas had Spanish as their native language before "La Conquista" during the 16th century.
