Then you can hit the road again. Still in Nebraska, for a long, long time. Maps in the Rand McNally Road Atlas are drawn to scale, but it's not the same from state to state. In other words, just because on the page Nebraska is as wide as Michigan that doesn't mean the same will hold true on the road. It's probably twice as long a drive, and the only difference between taking U.S. 20 or I-80 across Nebraska is that along U.S. 20, the hundreds of miles of cornfields are interrupted occasionally by a town you have to slow down for.
Same thing goes with Iowa.
Except at the east end on the banks of the Mississippi, you'll find the town of Dubuque. I took the test run. Not long after you cross into Illinois, you'll have a chance to pull into the town of Galena. Park your car and walk up the gentle slope that is the main street. You'll swear you just stepped into the '9th Century.