Do you know the significance of - 4 April ?

1850, Los Angeles was incorporated as a U.S. city (official California statute). https://buff.ly/2OMqK5Z 1905 Earthquake in Kangra India, kills 20,000. https://buff.ly/2UvklS6 1949 NATO is formed 12 nations signed the North Atlantic Treaty to establish what is today one of the world's most important military alliances. https://buff.ly/2UgL6uk 1968 Martin Luther King Jr. is assassinated. https://buff.ly/2p9qu4R 1969 Denton Cooley implants the first artificial heart The machine kept patient Haskell Karp alive for 65 hours. He died before a human heart could become available. https://buff.ly/2CW2IAN 1973 World Trade Center, then the world's tallest building, opens in New York (110 stories). https://buff.ly/2UxBkTR 1975 Bill Gates and Paul Allen establish Microsoft Microsoft has developed into a multinational corporation, and it is the world's largest software maker by revenue. https://buff.ly/2WN2yDv 2014 President of the World Bank, Jim Yong Kim, claims that climate change will lead to battles over water and food within the next five to ten years 2018 21st Commonwealth Games open in the Gold Coast, Australia https://buff.ly/2FRtZF8