Panama Canal Construction
Colombia
1903, Aug 12
The Congress of Colobmia rejected the Hay-HerrĂ¡n treaty (would have given the US rights to build the canal). The Colombia government wanted more money, were suspicious of US motives, didn't want to give away sovereignty of their territory, and it was unpopular with the citizens.
As a result the US carved separated Panama from Colobmia and stope the Colobmian army with gun boats. Philippe Bunau-Varilla (French engineer behind the canal) signed the treaty as the ambassador of Panama. Panama was a protectorate until 1939.
Sources
Building the Panama Canal, 1903 - 1914
https://history.state.gov/milestones/1899-1913/panama-canal
Books
The Path Between the Seas: The Creation of the Panama Canal, 1870-194
by David McCullough
Construction of the Canal