Which company originally manufactured the P-51 Mustang fighter aircraft during WWII before later becoming part of a larger defense contractor through acquisition?

Throughout military history, many aerospace companies have developed iconic aircraft that changed the course of warfare. These manufacturers often underwent significant corporate mergers and acquisitions, creating complex corporate histories. This poll tests your knowledge of one famous military aircraft manufacturer's corporate evolution and its impact on modern defense contracting.

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North American Aviation (later acquired by Rockwell, then Boeing)
Curtiss-Wright Corporation (later acquired by Lockheed Martin)
Republic Aviation (later acquired by Fairchild, then Northrop Grumman)
Bell Aircraft Corporation (later acquired by Textron)