1970 to 1979

What happened in history...

1970 - The first Earth Day is observed
1970 - American Top 40, hosted by radio personality Casey Kasem, becomes the first successful nationally syndicated radio program featuring a weekly countdown
1971 - A ban on radio and television cigarette advertisements goes into effect in the United States
1972 -  President Nixon re-elected as President
1973 - Skylab launched as the USA's first space station
1974 - Hank Aaron of the Atlanta Braves breaks Babe Ruth's home run record by hitting his 715th career home run
1974 - President Nixon resigns, becoming the first and only President to step down. Vice president Ford becomes President
1974 - Watergate scandal: Ford pardons Nixon for any crimes he may have committed against the United States while President, believing it to be in the "best interests of the country"
1975 - Bill Gates founds Microsoft, which in time dominated the home computer operating system market
1975 - President Ford survives two assassination attempts in a 17-day time span
1975 - The television series Wheel of Fortune and Saturday Night Live premier on NBC
1976 - Jimmy Carter of Georgia defeats President Ford
1977 - The first home personal computer, Commodore PET, released for retail sale
1977 - Elvis Presley, the king of rock and roll, dies in his home in Graceland at age 42. 75,000 fans lined the streets of Memphis for his funeral
1978 - The Senate votes to turn the Panama Canal over to Panamanian control on December 31, 1999
1979 - Three Mile Island nuclear accident, which is America's most serious nuclear power plant accident in its history
1979 - American Airlines Flight 191 crashes after takeoff from O'Hare International Airport killing all 271 aboard and 2 on the ground, making it the deadliest aviation incident on U.S. soil