提高听力同时，你还可以了解到美国历史上的一些重要事件。请感兴趣的你一听为快吧！
<注意>国家名大写
hints：Ben Nighthorse Campbell
Puerto Rico
César Chávez
the United Farm Workers Union
In 1992, Ben Nighthorse Campbell became the first Native American elected to the Senate. Hispanic Americans from Mexico, Central America, Puerto Rico and Cuba were politically active too. They fought against discrimination. They were elected to local, state, and national positions. César Chávez organized a nationwide boycott of California grapes that forced growers to work with the United Farm Workers Union.
1992年，Ben Nighthorse Campbell成为第一个美国本地人当选为参议院。来自墨西哥，中美洲，波多黎各和古巴的西班牙裔美国人在政治上活跃。他们反对歧视。他们分别是当选地方，州和国家的职务。塞萨尔查韦斯举办的全国性抵制加州葡萄迫使种植者与美国农场工人联盟工作。