March 21, 1964 - What was happening in the world on this date? Well, read the attached Competition Press and Auto Week newsletter and you will find out where the first Mustang was introduced.
http://autoweek.com/sites/default/files/19640321-NEWS--0001-NAT-CCI-AW_--_3994395.PDF
http://autoweek.com/sites/default/files/19640321-NEWS--0001-NAT-CCI-AW_--_3994395.PDF