Here’s a look at some interesting events that took place on this day in history:

1863 – The Battle of Gettysburg begins (More info)

1867 – Canada becomes a self-governing dominion of Great Britain under the British North America Act (More info)

1963 – ZIP Codes are introduced for United States mail (More info)

1979 – Sony introduces the Walkman, the first device that allowed people to carry music with them and listen through lightweight headphones (More info)

1997 – China resumes sovereignty over Hong Kong, ending 156 years of British colonial rule (More info)