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Not all Spanish speakers in the US are Hispanics. In fact there are approximately 2.8 million Non-Hispanics that speak Spanish at home. That's a lot of people that can speak Spanish.
I think it would also be very interesting to see the percentage of Spanish speakers in each of these countries. For example, while there may be millions of Spanish speakers in the U.S., this accounts for only 10 percent of the population: savvyroo.com/chart-9081046905…
I think another interesting angle would be to see how many people who begin learning Spanish in high school actually continue developing the skill. My guess would be that it is a rather small percentage of the population that choose to continue learning the language.
I found it interesting, that of 22 countries that have Spanish as their national language, the US (not one of those countries on the list) would have the 5th largest Spanish speaking population.