Newfoundland? Not much to go off of here but alright.
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Answer:
They wanted to expand their terratory
Explanation:
Since the US was almost complete, and only a few indian tribes lived in plantations made by the US goverment. The goverment wanted to make America whole so that is why they decided to wage war in the 19th century.
Colombia.
Previously, Panama was part of Colombia, which denied the Canal that would cross the country as a commercial route proposed by the United States, because of this, the insurgent population of Panama or "rebels" were the US army to defeat the Colombian nation Satisfactorily, and establish Panamanian independence, which would consequently yield the fruit of the Panama Canal.