◆ On this day

September 3

4 sourced moments from September 3 in history: The Treaty of Paris recognized American independence (1783); Britain and France Declared War on Germany (1939); Sweden switched to driving on the right overnight (1967), plus 1 more.

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4 things happened on September 3

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1976 Space · Space Exploration

Viking 2 landed on Mars in 1976 and saw water-ice frost

NASA's second Mars lander touched down on Utopia Planitia on September 3, 1976, chosen for nearby water, and later photographed frost on the rocks.

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1967 Technology · Transportation

Sweden switched to driving on the right overnight

In a single carefully rehearsed morning, an entire nation moved from the left side of the road to the right.

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1939 History · War & Conflict

Britain and France Declared War on Germany

Two days after Hitler invaded Poland, Chamberlain's radio broadcast plunged Britain into a second world war.

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1783 History · Modern

The Treaty of Paris recognized American independence

With a few signatures in a Paris hotel, Britain formally acknowledged the United States as a free and independent nation.

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