You will be given a definition of a task first, then some input of the task.
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

The Arizona Territory was an American territory from February 24 , 1863 to February 14 , 1912 .
Output:
The Territory of Arizona ( also known as Arizona Territory ) was a territory of the United States that existed from February 24 , 1863 until February 14 , 1912 , when the remaining extent of the territory was admitted to the Union as the state of Arizona .