Zefram Cochrane was the man who developed the first Terran warp drive. Soon after, he led the attack against the Vulcan invasion force that arrived in Bozeman, Montana on Earth on April 5, 2063. His actions prevented Terrans from becoming subordinate to the Vulcans instead of the other way around.
On that fateful day, the Vulcan ship T'Plana-Hath landed in Bozeman and its captain stepped out, giving Cochrane a devious hand symbol and deceptively stating "live long and prosper". A resident of Bozeman at the time, Cochrane "greeted" the Vulcan captain with a shotgun blast to the chest, and rallied the other Terrans in his midst to raid the Vulcan ship for their technology.
Nearly 92 years later, the Vulcan people were subjects of the Terran Empire. Captain Maximilian Forrest kept Cochrane's shotgun in his ready room aboard the ISS Enterprise. (ENT: "In a Mirror, Darkly")