<Li> 1882: The Knights of Columbus are founded in New Haven . The city still serves as the world headquarters of the organization, which maintains a museum downtown . </Li> <Li> 1892: Local confectioner George C. Smith of the Bradley Smith Candy Co. invents the first lollipops . </Li> <Li> Late 19th century - early 20th century: The first public tree planting program takes place in New Haven, at the urging of native James Hillhouse . </Li> <Li> 1900: Louis Lassen, owner of Louis' Lunch, is credited with inventing the hamburger, as well as the steak sandwich . </Li>

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