Because of the pigheaded CEO's that still believed that USA, is the only source of intelligent life.
Why Do You Think That Companies In The United States Were Slow To Adopt The Quality Management Principles Japanese Companies Had Used To Gain Market Share Worldwide?
United States was slow to adopt the emerging strategies used by Japanese because they though for a very long time that they were the best. They thought Japanese were conservative and did not experiment that was why they rejected their quality management techniques.