měi guó qián zhí mín shí dài Pre-Columbian period   měi guó zhí mín shí dài Colonial period of the United States   měi guó guó Formation of the United States of America   měi guó xiàng kuò zhǎn Westward expansion   měi guó nèi zhàn shí Civil War era   měi guó chóngjiàn gōng huà Reconstruction and the rise of industrialization    zhàn zhōng jué Progressivism, imperialism, and World War I   měi guó jīng xiāo tiáo Post-World War I and the Great Depression   èr zhàn zhōng de měi guó United States in World War II   lěng zhàn kāi shǐ The Cold War begins   lěng zhàn zhōng de měi guó The Counterculture Revolution and Cold War Détent   lěng zhàn jié shù The end of the Cold War   xiàn dài měi guó Modern American   běi měi yóu mào xié North American Free Trade Agreement   

guójūnjìniánxìngmíngkāiduānniánfènzhōngjiéniánfènyánxùshíjiàn
·S· mén ·S· mén Harry S. Truman1945nián1953nián9nián
huái · wèi · ài sēn háo wēi 'ěr huái · wèi · ài sēn háo wēi 'ěr Dwight David Eisenhower1953nián1961nián9nián
yuē hàn ·F· kěn kěn John Fitzgerald Kennedy1961nián1963nián3nián

  èr shì jiè zhàn jiān měi guó yán zhì chū dàn tóubìng zài 1945 nián tóu xiàng běn shǐ běn tóu jiàng
  
   zài zhàn zhēng shèng hòu yīng guó wéi shǒu de 'ōu zhōu guó jiāyuán jìn shāngměi guó jìn guǎn zài 'èr zhàn zhōng chū chén zhòng dài jiàyóu měi guó běn wèi céng zāo zhàn huǒ sǔn shī què shì zhàn shèng guó zhōng xiāng duì xiǎoměi guó jiè zhù jīng jūn shì liàngchéng wéi shì jiè tóu hào guó lián píng píng zuòbìng yǐn liǎo lěng zhànměi guó dài biǎo de shì běn zhù yóu mín zhù zhìér lián dài biǎo gòng chǎn zhù jìhuà jīng lián de jué shí xíng tài de chā měi guó de tào shuāng fāng chōng zào chéng liǎo 1940 nián dài kāi shǐ de lěng zhàn 1945 nián měi guó lián zài duō guó jiājìn xíng lián chuàn dài rén zhàn zhēngzuì xiān yòu dōng de fēn lièhòu lái bāo kuò liǎo cháo xiān zhàn zhēng zhì liù shí nián dài chū chù zhàn wēi de dǎo dàn wēi
  
   lěng zhàn jiān lián zhǎn tài kōng pài chū liǎo quán qiú shǒu tài kōng rén jiā jiā lín shàng tài kōngměi guó jǐng jué dào lián de tài kōng jìng sài shàng de luò hòuměi guó zhèng kāi shǐ péi yǎng shù xué xué rén cáizài měi guó guó jiā háng kōng háng tiān de xià 1969 nián chéng gōng pài rén dēng shàng yuè qiú


  Following World War II, the United States emerged as one of the two dominant superpowers. The U.S. Senate, on December 4, 1945, approved U.S. participation in the United Nations (UN), which marked a turn away from the traditional isolationism of the U.S. and toward more international involvement. The post-war era in the United States was defined internationally by the beginning of the Cold War, in which the United States and the Soviet Union attempted to expand their influence at the expense of the other, checked by each side's massive nuclear arsenal and the doctrine of mutual assured destruction. The result was a series of conflicts during this period including the Korean War and the tense nuclear showdown of the Cuban Missile Crisis. Within the United States, the Cold War prompted concerns about Communist influence, and also resulted in government efforts to focus mathematics and science toward efforts such as the space race.
  
  In the decades after World War II, the United States became a global influence in economic, political, military, cultural, and technological affairs. Beginning in the 1950s, middle-class culture had a growing obsession with consumer goods.
  
  John F. Kennedy was elected President in 1960. Known for his charisma, he is so far the only Roman Catholic to be President. The Kennedys brought a new life and vigor to the atmosphere of the White House. During his time in office, the Cold War reached its height with the Cuban Missile Crisis in 1962. He was assassinated in Dallas, Texas, on November 22, 1963 by Lee Harvey Oswald.

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