1807 Innovation of the steamboat

1804 Haiti declared its independence from France

1924 Astronomer Edwin Hubble formally announced that the Milky Way is just one of many galaxies in the universe

2002 The Legislative Assembly appointed Eduardo Duhalde as interim President of Argentina

1940 Winston Churchill became British Prime Minister, replacing Neville Chamberlain

1994 The implementation of the North American Free Trade Agreement

1921 The Communist Party of China (CPC) was formed, and Chen Duxiu was elected its leader

1994 Nelson Mandela sworn in as the first black president of South Africa

1917 President Woodrow Wilson asked Congress to declare war against Germany

1836 Spain recognized the independence of Mexico by signing the Santa María–Calatrava Treaty

1956 Dutch swimmer Cockie Gastelaars broke two decades' world record for 100m freestyle

1997 The United Kingdom returned Hong Kong to the People's Republic of China

2003 The Spirit Rover was launched by NASA to start the Mars Exploration Rover mission

2018 WHO officially announced it will categorize gaming addiction as a mental health condition

1895 German physicist Wilhelm Conrad Röntgen discovered X-Rays

1903 Innovation of the aeroplane