The most spoken language in any country is much a no-brainer: It's the country's official language.
A country's second-most spoken language is not always so obvious. And in some cases it's really surprising.
Olivet Nazarene University developed an incredible interactive graphic that lets you explore every country's second-most spoken language. They pulled the data from a variety of sources, including the CIA's World Factbook.
Analyzing the second-most spoken language of a country can reveal a lot about the country's or the region's history. For example, Algeria, Tanzania, and Tunisia all share French as their second-most spoken language since France established earlier colonies in these countries.
You can explore other countries in the graphic below:
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