Slavery played a major role in America's development, but a new study shows students don't know much about it. One recent textbook referred to enslaved people as 'workers' ... which suggests some schools still struggle to teach this topic. It's hard history, but is there an easy fix? And what's at stake if it's not figured out? | Want to help us improve? Share your thoughts at npr.org/podcastsurvey. Want to support 1A? Subscribe to our podcast and give to your local public radio station at donate.npr.org/1A. Email the show at 1a@wamu.org.