Create Nebraska Shapefile

using QGIS

Add vector data:

Choose CountyElectionModified or another layer of US states

Open Attribute Table

Toggle editing ON

Click -> Select Features Using an Expression

In Fields and Values choose -> States and double click

Equals “=” sign

Load All unique values

Choose ‘31’ and double click

Now save selection as a shapefile

Right click on Layer

Save as: ESRI shapefile – Check box that says “Save only selected features”