Final answer:
The term for the practice of Americans financing private armies in an attempt to capture and/or occupy foreign territory, particularly in Latin America, without official approval of the United States is filibustering.
Step-by-step explanation:
The term for the practice of Americans financing private armies in an attempt to capture and/or occupy foreign territory, particularly in Latin America, without official approval of the United States is filibustering.
Filibustering was a common practice in the 19th century, where American citizens formed themselves into private armies to forcefully annex new land without the government's approval. These unsanctioned military adventures were not part of the official foreign policy of the United States.
One notable example of filibustering was an expedition of two hundred Americans who invaded Spanish Texas in 1819 with the intention of creating a republic modeled on the United States, but they were driven out by Spanish forces.