History
The XD traces its roots back to a service pistol known as the PHP, which was first produced in Croatia by privately owned industrial parts firm I.M. Metal in 1991 . Designed by a team led by Marko Vukovic, the PHP was considered to be a solid design, but early versions were plagued by quality issues, due in large part to the difficulties of manufacturing during a liberation war. Vukovic's team continued to tweak and improve the design over the next decade, releasing the HS95 (Hrvatski Samokres or "Croatian Pistol") in 1995, and the HS2000 in 1999 .
The HS2000 was adopted by the Croatian military and law enforcement as their standard issue sidearm, and continues to fill that role today. In addition, the pistol was exported to the US market by Intrac and distributed by HSAmerica, which sold the pistol in 9mm as the HS2000, and started to gain a reputation as a cost-effective, reliable, and innovative new firearm.
In 2002, Springfield Armory, Inc. secured the licensing rights to the US market, and rebranded the pistol to XD-9 (X-treme Duty 9x19 mm). Since that time Springfield Armory has expanded the line to include five different calibers, three different barrel lengths, and four finishes (black, stainless steel, Olive Drab, and the newest Dark Earth). Due in part to Springfield Armory's aggressive marketing and competitive pricing, but also to the pistol's inherent quality and features, it has consistently gained in both reputation and market share over the last five years. The introduction of the XD-45 (in the extremely popular .45 ACP caliber) in January of 2006 has made the XD the "most talked about handgun" in the eyes of many interested shooters. The industry press took notice as well, awarding the XD-45 the title of "Handgun of the Year" from both American Rifleman magazine and the The Shooting Industry Academy of Excellence.
From wikipedia
http://en.wikipedia.org/wiki/Springfield_Armory_XD