◆ On this day

October 20

3 sourced moments from October 20 in history: The Day a Line of Latitude Became the US-Canada Border (1818); MacArthur said "I shall return" in Australia, not Corregidor (1944); and The Sydney Opera House officially opened (1973).

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3 things happened on October 20

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1973 Geography · Landmarks & Wonders

The Sydney Opera House officially opened

On October 20, 1973, Queen Elizabeth II opened the Sydney Opera House, sixteen years after its bold sail-shaped design won an international competition.

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1944 History · War & Conflict

MacArthur said "I shall return" in Australia, not Corregidor

MacArthur waded ashore on Leyte on 20 October 1944 to keep a pledge he first made on a South Australian railway platform in 1942.

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1818 Geography · Borders & Maps

The Day a Line of Latitude Became the US-Canada Border

In one London signing, two former enemies agreed to let geometry settle a continent's worth of contested wilderness.

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