GU. An unincorporated territory of the United States, the largest and most southerly of the Mariana Islands in the western Pacific Ocean. Inhabited since ancient times by the Chamorro people, Guam was visited by Magellan in 1521 and ceded by Spain to the United States in 1898. Agana is the capital.
The Republican victory in that election resulted in seven Southern states declaring their secession from the Union even before Lincoln took office on March 4, 1861. Both the outgoing and incoming U.S. administrations rejected secession, regarding it as rebellion.
In the context of the United States, secession primarily refers to the withdrawal of one or more States from the Union that constitutes the United States; but may loosely refer to leaving a State or territory to form a separate territory or new State, or to the severing of an area from a city or county within a State.