New York City

"You're about to be the last eligible man in New York. You know, there's three and a half million women here."

- Bucky Barnes to Steve Rogers

New York City is the largest city in the state of New York, and of the United States of America. It is one of the largest cities on Earth as well.

World War II
In New York City, March 1941, Steve Rogers was rejected for military duty in World War II due to various health and physical issues that he had. While attending an exhibition of future technologies with his friend James "Bucky" Barnes, Rogers attempted to again enlist. Having overheard Rogers' conversation with Barnes about wanting to help in the war, Dr. Abraham Erskine allowed Rogers to enlist.

Some time later, in a secret SSR laboratory in New York, Erskine subjected Rogers to the super-soldier treatment, injecting him with a special serum and dosing him with "vita-rays". Rogers emerged from the experiment taller and muscular. After the experiment, one of the attendees shot and killed Erskine, revealing himself as HYDRA agent Heinz Kruger. Rogers pursued and captured Kruger but the assassin committed suicide via cyanide capsule before he could be interrogated.

In 1945 HYDRA planned to launch a HYDRA Parasit on New York City.

21st Century
When Captain America was found, he was placed within New York City in hopes that he could be transitioned easier into the 21st century. However, he realized the ploy and ran into Times Square, followed by Nick Fury and S.H.I.E.L.D. agents; as Rogers noted his new surroundings, Fury welcomed him to the present after nearly 70 years of sleep.

Duel of Harlem
In 2011, the city suffered from major damage made after Emil Blonsky forced Dr. Samuel Sterns to inject the blood of Bruce Banner - the Hulk - into him, turning him into the Abomination and making him go on a rampage in the city. In order to stop him, Banner turned into the Hulk and confronted the Abomination, causing more chaos in the streets and on the rooftops, before the Hulk finally subdued the Abomination and the Abomination was taken into custody.

War for Earth
In 2012, Tony Stark created the Stark Tower in New York City and made it the new headquarters of Stark Industries. New York City later became a battleground once more, when Loki had the Tesseract transported to the top of Stark Tower and created a portal between Earth and the Chitauri homeworld, which resulted in a Chitauri invasion in the city. The Avengers, a team of superheroes consisting of Iron Man, Captain America, Thor, Hulk, Black Widow and Hawkeye faced the Chitauri, while the World Security Council planned to solve the problem by having New York City nuked. Before using Loki's own staff to close the Tesseract's portal, Iron Man maneuvered the nuclear rocket through the portal and into the Chitauri army. The remaining Chitauri died due to the device controlling them being blown up, and the city was saved.

Cosplayers started gathering around the Stark Tower, hoping to see an Avenger.

Item 47
One of the Chitauri Guns used in the Battle of New York was found by Benjamin Pollack and his girlfriend and used to commit bank robberies across the East Coast before they were recruited to S.H.I.E.L.D by Agent Jasper Sitwell.

The Melter Attacks
Sometime after the battle of New York, Tony Stark organized a press conference in front of the Stark Tower, but he was attacked by Bruno Horgan, also known as the Melter. After a quick victory, the Melter announced that he would be selling the designs of his technology in a few days. Two days later he attacked, and with some effort, secured a victory over War Machine. This led both Stark and Rhodes to confront Horgan together, who promptly was defeated and placed into US military custody.