Today in history – August 20

1741 – Danish navigator Vitus Jonas Bering discovered what is now called Alaska.

1858 – Charles Darwin first publishes his theory of evolution.

1866 – President Andrew Johnson formally declares the Civil War over.

1920 – The National Football League is organized as the American Professional Football Conference in Canton, Ohio.

1968 – Warsaw Pact troops invaded Czechoslovakia to crush the “Prague Spring.”

1996 – President Bill Clinton signed into law an increase in the minimum wage.