wow you guys are brilliant, the colt .45 was originaly disigned and manufactured for use over seas by us soldiers in world war II, as it turns out the pistol was very accuret light wheight, and versatile. the colt .45 has become obsolete and is no longer used by the armed forces, it has been replaced by a similar pistol that has stealth capabilities, um i have alot of friends who serve in the military lol 
Your wrong.
The 1911 was NOT manufactured for use in world war II, it has quite an earlier history than that. It was used in World War II however.
The M1911 pistol originated in the late 1890s, as a search for a suitable self-loading (or semi-automatic) handgun, to replace the variety of revolvers then in service. The United States of America was adopting new firearms at a phenomenal rate; several new handguns and two all-new service rifles (the M1892/96/98 Krag and M1895 Navy Lee), as well as a series of revolvers by Colt and Smith & Wesson for the Army and Navy were adopted just in that decade. The next decade would see a similar pace, including the adoption of several more revolvers and an intensive search for a self-loading pistol that would culminate in official adoption of the M1911 after the turn of the decade.
Hiram S. Maxim had designed a self-loading pistol in the 1880s, but was preoccupied with machine guns. Nevertheless, the application of his principle of using bullet energy to reload led to several self-loading pistols in the 1890s. The designs caught the attention of various militaries, which began programs to find a suitable one for their forces. In the U.S., such a program would lead to a formal test at the turn of the 19th to the 20th century.
Following its success in trials, the Colt pistol was formally adopted by the Army on March 29, 1911, thus gaining its designation, M1911 (Model of 1911). It was adopted by the Navy and Marine Corps in 1913. Originally manufactured only by Colt, demand for the firearm in World War I saw the expansion of manufacture to the government-owned Springfield Armory.
Battlefield experience in the First World War led to some more small external changes, completed in 1924. The new version received a modified type classification, M1911A1. Changes to the original design were minor and consisted of a shorter trigger, cutouts in the frame behind the trigger, a curved mainspring housing, a longer grip safety spur (to prevent hammer bite), a wider front sight, a shorter spur on the hammer, and simplified grip checkering. Those unfamiliar with the design are often unable to tell the difference between the two versions at a glance. No internal changes were made, and parts remained interchangeable between the two.
World War II and the years leading up to it created a great demand. During the war, about 1.9 million units were procured by the U.S. Government for all forces, production being undertaken by several manufacturers, including Remington Rand (900,000 produced), Colt (400,000), Ithaca Gun Company (400,000), Union Switch & Signal (50,000), Singer (500), the Springfield Armory and Rock Island Arsenal. So many were produced that, after 1945, the government did not order any new pistols, and simply used existing parts inventories to "arsenal refinish" guns when necessary. This pistol was favored by US military personnel.[2]
Before World War II, a small number of Colts were produced under license at the Norwegian weapon factory Kongsberg Vaapenfabrikk (these Colts were known as "Kongsberg Colt"). During the German occupation of Norway the production continued; these pistols are highly regarded by modern collectors. German forces used captured M1911A1 pistols, using the designation "Pistole 660(a)".[1] The 1911 pattern also formed the basis for the Argentine Ballester-Molina and certain Spanish Star and Llama pistols made after 1922.
After the Second World War, the M1911 continued to be a mainstay of the United States Armed Forces in the Korean War and the Vietnam War and was even used during Desert Storm in some U.S. Army units.
However, by the late 1970s the M1911A1 was acknowledged to be showing its age. Under political pressure from NATO to conform to the NATO-standard pistol cartridge, the US Air Force's Joint Service Small Arms Program was run to select a new semi-automatic pistol using the NATO-standard 9 mm Parabellum pistol cartridge (a cartridge that had been previously tested by the US Army in 1903 and found wanting). After trials, the Beretta 92S-1 was chosen. This result was contested by the Army which subsequently ran its own competition (the XM9 trials) in 1981 which eventually lead to the official adoption of the Beretta 92F on January 14, 1985. By the later 1980s production was ramping up despite a controversial XM9 retrial and a separate XM10 reconfirmation, which was boycotted by some entrants of the original trials, cracks in the frames of the Beretta-produced pistols, and also despite a dangerous problem with slide separation that resulted in injuries to some US Navy service members. This last resulted in it being updated to the 92FS standard, which includes additional protection for the user.
By the early 1990s, most M1911A1s had been replaced by the M9, though a limited number remain in use by special units. The United States Marine Corps in particular were noted for continuing the use of M1911 pistols for selected personnel in MEU(SOC) and reconnaissance units (though the USMC also purchased over 50,000 M9 handguns). For its part, the United States Special Operations Command (USSOCOM) issued a requirement for a .45 ACP handgun (Offensive Handgun Weapon System (OHWS) trials). This resulted in the Heckler & Koch OHWS becoming the MK23 Mod 0 Offensive Handgun Weapon System (beating a Colt OHWS, a much modified 1911). Dissatisfaction with the Beretta M9's stopping power has actually promoted re-adoption of the 1911 (along with other handguns) among USSOCOM units in recent years, though the M9 remains predominant both within SOCOM and in the US military in general.
By the way the 1911 is still in use by special forces, many home users still use 1911's.
The current issued side arm being the Beretta m9 is a peice of excrement and 9mm is too small.
There are still many modern firearms that use .45 ACP, I own several.
There are also modern 1911 variants by Kimber, Springfield, Para Ordnance and a few others.
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