credit Photo: Ford Motor Co.When Ford unveiled the Mustang 45 years ago today, company execs figured they’d sell maybe 100,000 a year. They sold 22,000 on the first day. The Mustang was more than a success. It was a phenomenon. Ford sold 1 million in the first 18 months, making the Mustang its most successful […] credit Photo: Ford Motor Co. When Ford unveiled the Mustang 45 years ago today, compa