July 1 in history: World's first international call, Hong Kong officially reverts to China and more

From the World's first international call to Hong Kong reverting to China, we've got it all covered!

Let's dive in today's history.

1881

World's first international call is made between Canada and US.

(Photograph:WION)

1908

SOS is adopted as the International Distress Signal.

(Photograph:WION)

1991

Warsaw Pact is formally disbanded in Prague.

(Photograph:WION)

1997

Hong Kong officially reverts to China after 156 years of British rule.

(Photograph:WION)

2002

The International Criminal Court (ICC) is established in The Hague.

(Photograph:WION)