7 demographic trends shaping the U.S. and the world in 2018

Millennials are projected to outnumber Baby Boomers next year.

A record number of Americans live in multigenerational households, part of a broader trend toward more shared living.

The institution of marriage continues to change.

After decades of decline, motherhood and family size are ticking up in the U.S.

There are more than 250 million migrants worldwide.

New refugee arrivals are down in the U.S. and their religious composition has changed.

International arrivals to the U.S. have risen among some groups.