In the 1930s, the Home Owner's Loan Corporation published a series of maps that would change U.S cities forever. These maps cut-up cities along ethnic lines, declaring entire neighborhoods unfit for home ownership. The divisions produced by these maps resulted in patterns of segregation still seen in cities today.
Section of the Milwaukee HOLC map.
The neighborhoods created by HOLC maps were arbitrary.
This tool allows use to take apart the HOLC map and rearrange the pieces however you like: i.e. break the map.
When you look at the interactive map below, you'll see the Milwaukee HOLC map.
You can select HOLC zones to uncover more information.
When you're ready, you can Break the Map
Then, you can rearrange the disembodied HOLC pieces by dragging them onto the map.