The mix of Spanish and English is the world’s fastest growing linguistic hybrid. Experts calculate that it is spoken by 50 million people

In a single sentence, Rolando Hernández moves smoothly between English and Spanish. His narration is uninterrupted through shifts from one tongue to the other. He’s not doing it to translate what he’s saying; he simply takes for granted that the person listening to him will understand. The 26-year-old Cuban American is trilingual: he doesn’t just speak English and Spanish, but also Spanglish, a hybrid speech variety that was born out of the mix of Anglo and Hispanic cultures. In his Miami neighborhood of Hialeah, where three-quarters of residents are of Cuban descent and 95% of the population is Hispanic, Spanglish (in Spanish, espanglish) rules: “It’s everywhere, from the closest McDonald’s drive-through to the galleries in Wynwood,” says Hernández.

Though it is hard to know the exact number of people who speak Spanglish, it’s estimated that there are 35 to 40 million people in the United States who, like Hernández, communicate with it, more than half of the 62 million Latinos who live in the country. It’s a number that will only grow as the Latino community expands over the coming years: by 2060, it is predicted that one in every four U.S. residents will have Latino heritage. “It is the fastest-growing hybrid language in the world,” says Ilan Stavans, professor of Latinx and Latin American studies at Massachusetts’s Amherst College.