June 19, or Juneteenth, is a holiday that commemorates the day that Texas, the last Confederate state, learned about the Emancipation Proclamation — marking the end of slavery in the United States in 1865.

But as University of Pittsburgh historian Alaina Roberts notes, it’s important to remember that the emancipation of slaves didn’t actually happen in one fell swoop. Here’s information about talking to children about Juneteenth and why it is important to do so.