1804: The year the human race first reached 1 billion people on earth

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1804

It is estimated that the world population reached one billion for the first time in 1804. It was another 123 years before it reached two billion in 1927, but it took only 33 years to reach three billion in 1960.

World population - Wikipedia

And it took only 60 more years to add 5 billion more people which is probably why we have the coronavirus now.