It means to take control of
Annexation means dropping from a group of states or provinces
A provocation to start a war, as Mexico had already warned the US that annexation would mean war (it did; and Mexico lost).
Business men were in favor of annexation.
missionaries
The United States purchased the Philippines from Spain but conquered Guam.
Business men were in favor of annexation.
The annexation of Texas.
annexation
missionaries
Florida Purchase, Louisiana Purchase, Texas Annexation, Annexation of Hawaii, Philippines and others..
Border disputes and the US Annexation of the Republic of Texas as a US State.
The annexation of Texas as a US state in 1846 directly led to the war, but US ambitions toward the Mexican lands in the West were the driving force for the conflict.