> How the hell do you get it to do a real union?
Heh. Intuitive ArcMap is not. It took me forever to figure it out as well. You can do a union a couple different ways. The way that seemed to work the best for this is to: 1) Run ArcMap 2) Add the shapefile to your map 3) Open the edit toolbar. 4) Click on Start Editing. 5) Select the entire dataset by left clicking and then dragging a rectangle around the geometry. 6) Select Union from the menu on the edit toolbar. You should see the union happen right before your eyes. I think I tried the Union Tool like you did and didn't get what I expected. I think it just did a union on each individual feature instead of doing an aggregate union.
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