Any insular area of the United States was considered officially, by the federal government, a non-integral part of the United States.

美国的任何岛屿地区都被联邦政府正式视为美国的非不可分割的一部分。

The US had to come up with an entirely new classification of land just for these guano islands: the insular areas.

美国不得不为这些鸟粪岛提出一个全新的土地分类：岛屿地区。