2014 Event Colorado's recreational marijuana stores open for business; voters approved the landmark law to legalize the sale of marijuana in 2012 1988 Event New York City's Rockefeller Center declared a national landmark 1986 Event Reagan signs landmark immigration reform bill 1970 Event Golden Gate Park Conservatory becomes a California state historical landmark 1970 Event Golden Gate Park Conservatory made city landmark 1964 Event San Francisco cable cars declared a national landmark 1960 Event Senate passes landmark Civil Rights Bill 1960 Event Senate passes landmark Civil Rights Bill 1958 Event Union Square, San Francisco becomes state historical landmark
