出口退税正式申报未过:Amerian 为什么翻译成 美国

惯例

这要感谢楼主，使我去查了一下American的出典：
The name America had been current ever since a German cartographer, Martin Waldseemüller, named the continent after explorer and navigator Amerigo Vespucci in 1507. Colonists from England, a century later, at first reserved the designation Americans for the original native inhabitants. Soon, however, the descendants of English settlers felt native enough to call themselves Americans, thereby to distinguish themselves from English visitors or immigrants. By 1700, writers on both sides of the Atlantic were discussing what it means to be an American--referring this time to the descendants of those who came from Europe. It remained for the Declaration of Independence to change all Americans from colonists of England to citizens of their own country.

American不是翻译成美国吧
美国不是America吗？
一般美国人都说他们国家是United States