Once a shape has been drawn on a tract, the shape will be saved until it is manually removed. To remove a tract's shape, follow the steps below.
1. Open the tract from which you would like to remove the shape
2. Click on the Remove link
Click on the Remove link, located near the top of the page. After you remove a Shapefile, the map will revert to the overview of North America and you can redraw the shape if desired.