I got 6/10 missed everything @cornflakesfu said plus Wyoming but Wyoming is just a wasteland with less than 600,000 residents who are cowboys in Cheyenne raiding Coloradans that drive into it (jk wyoming is awesome)
If you enter Nebraska from the east or west and immediately fall asleep, then awaken when you reach the next border, you'll think you haven't gone anywhere.
my mind must've just turned off lol
I assumed they had some forested areas.