Who did the US cooperate with in the 19th century to dominate Central America?

In the 19th century, the United States primarily cooperated with Great Britain to dominate Central America, particularly in relation to the construction of a transcontinental canal. The U.S. sought to expand its influence in the region, leading to agreements like the Clayton-Bulwer Treaty of 1850, which aimed to ensure joint control over any canal project. However, tensions arose as the U.S. later shifted towards unilateral control, particularly after the acquisition of Panama in the early 20th century.