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1、TimelineofUnitedStateshistory(1970–)FromWikipedia,thefreeencyclopediaThisarticledoesnotciteanyreferencesorsources.Pleasehelpimprovethisarticlebyaddingcitationstoreliablesources.Unsourcedmaterialmaybechallengedandremoved.(December2009)ThissectionoftheTimelineofUnitedStateshistoryconcernseventsfrom1
2、970to1989.[edit]1970s1970sintheUnitedStates:1970,1971,1972,1973,1974,1975,1976,1977,1978,1979.TheWatergatescandalcausesNixontobethefirstU.S.presidenttoresignfromoffice.·1970-KentStateandJacksonStateshootingsoccurduringstudentprotestswhichgrowviolent·1970-ThefirstEarthDayisobserved.·1970-Environmen
3、talProtectionAgencycreated·1970-AmericanTop40,hostedbyradiopersonalityCaseyKasem,becomesthefirstsuccessfulnationallysyndicatedradioprogramfeaturingaweeklycountdown.·1970-ThePublicBroadcastingSystem(PBS)beginsoperations,succeedingNationalEducationalTelevision(NET).·1970-TheOccupationalSafetyandHeal
4、thAct,orOSHA,issignedintolaw.·1971-PresidentRichardNixonendstheUnitedStatesGoldstandardmonetarypolicyknownastheNixonShock·1971-AbanonradioandtelevisioncigaretteadvertisementsgoesintoeffectintheUnitedStates·1971-Thelandmarksituationcomedy,AllintheFamily,premieresonCBS.·1971-26thAmendmentratified,al
5、lowing18-year-oldstovote·1971-InNewYorkTimesCo.v.UnitedStates,TheU.S.SupremeCourtrulesthatthePentagonPapersmaybepublished,rejectinggovernmentinjunctionsasunconstitutionalpriorrestraint.·1972-PresidentRichardNixonvisitsChina,animportantstepinformallynormalizingrelationsbetweentheUnitedStatesandChin
6、a.·1972-Anti-BallisticMissileTreatysignedwithUSSR·1972-Watergatescandal:FivemenarrestedfortheburglaryoftheDemocraticNationalCommitteeheadquartersattheWatergateofficecomplexinWashington,D.C.·1972-U.S.presidentialelection,1972(PresidentNixonre-elected)·1972-Apollo17fliestotheMoon,andbecomesthelastma
7、nnedmissionthere(asof2010)·1973-ParisPeaceAccordsendsdirectU.S.involvementintheVietnamWar·1973-Roev.WadeSupremeCourtrulingoverturnsstatelawsagainstabortion·1973-TheSenateWatergatehearingsbegin,highlightedbyFredTh
