Reticulan (Sliders)

The Reticulans are an alien race of greys that on a parallel Earth befriended humanity and traded technology.

History
The history of Earth differs from the mainstream timeline ins which in Adlai Stevenson became the 34th President of the United States. Under the Stevenson administration, American government offered transparency to its citizens and ushered in an era of trust between the populace and its elected representatives.

Therefore, when the Reticulan government crash-landed in Roswell, New Mexico, the government told the people, and created the Reticulan-American Free Trade Agreement (RAFTA) was born, giving the United States access to futuristic technology.

Source

 * Sliders: The Return of Maggie Beckett