What is the story line behind Deus ex?

I find myself mindlessly searching the web for the awnser only to come up with nothing. So can someone please explain to me what the story line is behind Deus ex?What is the story line behind Deus ex?
Deus Ex takes place in a dystopian future in a world that draws heavily upon present day conspiracy theories. This dark setting is enhanced by the fact that the entire game takes place at night, a backdrop that adds to the atmosphere of conspiracies and stealth. The game contradicts itself in several instances regarding the exact year in which the events of the story take place, but information in the sequel Deus Ex: Invisible War reconciles this inconsistency via retroactive continuity, placing the events of Deus Ex in the year 2052.[29] Most of the game takes place in fictionalized versions of real-world locations, including New York City, Hong Kong, Paris, Vandenberg Air Force Base, and Area 51.

The plot of Deus Ex depicts a society on a slow spiral into chaos. A lethal pandemic known as the "Gray Death" ravages the world's population, especially within the United States, and has no cure. A synthetic vaccine, "Ambrosia", manufactured by the company VersaLife, nullifies the effects of the virus, but is in critically short supply. Because of its scarcity, Ambrosia is available only to those deemed "vital to the social order", and finds its way primarily to government officials, military personnel, the rich and influential, scientists, and the intellectual elite. With no hope for the common people of the world, riots occur worldwide, and a number of terrorist organizations have formed with the professed intent of assisting the downtrodden, among them the National Secessionist Force of the US and a French group known as Silhouette.

In order to combat these threats to the world order, the United Nations has greatly expanded its governmental influence around the globe. The United Nations Anti-Terrorist Coalition (UNATCO) is formed, with the intent of maintaining peace internationally and combating the world's ever-growing number of terrorist groups.[30] It is headquartered near New York City in a bunker beneath Liberty Island, placed there after a terrorist strike on the Statue of Liberty.[31]