Amid news that the Chicago region led the country in population loss during 2015 comes this reminder of how Chicago has bolstered its population in recent decades:

More than any other city, Chicago has depended on Mexican immigrants to balance the sluggish growth of its native-born population, said Rob Paral, a Chicago-based demographer who advises nonprofits and community groups. During the 1990s, immigration accounted for most of Chicago’s population growth. The number of Mexican immigrants rose by 117,000 in Chicago that decade, making up 105 percent of all growth, according to data gathered by Paral’s firm, Rob Paral and Associates.

After 2007, falling Mexican-born populations became a trend across the country’s major metropolitan areas. But most of those cities were able to make up for the loss with the growth of their native populations, Paral said. Chicago couldn’t.

Chicago is often held up as a shining example of a Rust Belt city that survived and thrived – but this may have had less to do with grand building projects or powerful mayors or a prominent international presence and more with continuing to be a center for immigration.