Gotham City

Gotham City is a former American metropolis, currently blockaded by the US Military under the No Man's Land Protocol.

In the absence of federal oversight, control of Gotham rests officially with Mayor Roman Sionis, and his alter-ego, crime lord Black Mask.

No Man's Land Protocol
Two years before the events of Gotham: Hell on Earth, the crime within Gotham City had reached an extent that the United States government could no longer foresee a return to a civilised city. As such, they enacted the No Man's Land Protocol, and the city was removed from America and became a city-nation, quarantined by the United States Army. In the immediate chaos, a power duo of Roman Sionis and the Black Mask (secretly the same person) rose to a position of power. As the 'Mayor of Gotham', Sionis has ruled the city for the past two years.

Project: Archangel
Two years into the No Man's Land Protocol, and the situation within Gotham has, if anything, gotten worse. Elements within the United States government, and those abroad, press for a solution to be found. Towards this end, the United States Army suggest Project: Archangel - dropping Captain America into the city to raise a rebellion against Sionis' Regime. On April 8th, Year 1, Cap arrives within the city. That same evening, the Genesis Capsule from Earth-3 also crashes into the city.