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When only the federal government can print money, all the states use the same type of currency (or the type of money used in a country).
只有當聯邦政府有權印刷貨幣時，所有的州才能使用相同的貨幣（或一個國家使用的幣種）。
Another power of the federal government is to declare war (or to say that a war is beginning).
聯邦政府的另一項權力是宣戰（或宣布戰爭的開始）。
Obviously this power should exist only at the national level, because it doesn't make sense for one or two states to declare war against another country.
很明顯這項權力只應歸國家所有，因為一兩個州對另一個國家宣戰是講不通的。
Wars should happen only between countries.
戰爭只應該發生在國與國之間。
A third power of the federal government is to create an army (or the large group of people and organizations that fight to protect a country).
聯邦政府的第三項權力是創建軍隊（或為保家衛國而戰的一大批人或組織）。
States can have police that work within the state, but not armies that fight internationally or in other countries.
各州可以有州警察，而沒有在國際上或其在他國家作戰的軍隊。
Finally, the federal government can make treaties (or official agreements between countries).
聯邦政府的最后一項權力是簽訂條約（或國家之間的官方協議）。
For example, the United States is involved in NATO, spelled "N," "A," "T," "O," which stands for the North Atlantic Treaty Organizations, at the national level.
例如，美國以國家的身份加入了北約，北約是北大西洋公約組織的縮寫。
Individual states do not need to participate in NATO because the entire country participates in it at the federal level.
單個州不需要加入北約，因為整個國家以聯邦政府的身份加入了該組織。
譯文為可可英語翻譯，未經授權請勿轉載！
