Multiple realities
(covers information from several alternate timelines)
Nebraska was the location of Omaha
Omaha was a city in Nebraska on Earth.
In 1969, the US 498th Airbase Group, a United States Air Force facility, was located in Omaha. (TOS: "Tomorrow is Yesterday")
The 24th century Federation starship USS Omaha Nebraska was named after this city. (TNG: "Conspiracy")
In an alternate timeline in which Nazi Germany had invaded the United States, as of 1944 Omaha was controlled by American forces. (ENT: "Storm Front, Part II")
Omaha is named on a map of the United States (Die Vereinigten Staaten von Amerika). It is represented by a yellow circle.