The governor of Nebraska declared no mask mandates months ago but the 2 cities run by dictatorial Democrat's still have mask mandates, so you might want to check city mandates in the above named states before traveling to any of them.

"Omaha's mask mandate extended to May 25; will still apply to those age 5 and older"

"Lincoln's mayor extended the mask mandate until May 23; for those age 5 and older"