In which city did the Union Pacific rail construction begin?

The Pacific Railroad Act stipulated that the Central Pacific Railroad Company would start building in Sacramento and continue east across the Sierra Nevada, while a second company, the Union Pacific Railroad, would build westward from the Missouri River, near the Iowa-Nebraska border.

Answer:Omaha

Explanation: If you look at the map it starts at Omaha and its by Great Plains and Rocky Mountains but it doesn't start their