提高聽力同時(shí)，你還可以了解到美國歷史上的一些重要事件。請感興趣的你一聽為快吧！
<注意>國家大寫
hints：Progressive Era
During the Progressive Era, more immigrants settled in the United States. Almost 19 million people arrived between 1890 and 1921 from Russia, Poland, Greece, Canada, Italy, Mexico, and Japan. By the 1920s, citizens worried that the immigrants might take their jobs and change the culture of the United States. Although the government created quotas to restrict immigration, it relaxed those restrictions in the 1960s, assuring that the United States would remain a nation in which many different people and cultures could forge an identity as Americans.
在進(jìn)步時(shí)代，更多的移民定居在美國。來自俄羅斯，波蘭，希臘，加拿大，意大利，墨西哥，和日本，近19萬人， 在1890年和1921年之間抵達(dá)。到20世紀(jì)20年代，市民擔(dān)心的移民可能搶他們的工作，并改變美國的文化。雖然政府創(chuàng)建配額限制移民，但是在20世紀(jì)60年代放寬這些限制，保證美國仍將是一個(gè)國家，在許多不同的人民和文化可以偽造身份作為美國人。