How did the old Clayton bullet treaty of 1850 limit US enthusiasm for building a canal?

The Clayton-Bulwer Treaty of 1850 established a joint British-American agreement that neither nation would exclusively control any canal across Central America. This limitation dampened U.S. enthusiasm for building a canal, as it restricted American ambitions for unilateral expansion and control in the region. The treaty aimed to maintain balance and prevent either power from monopolizing trade routes, ultimately slowing the momentum for canal construction until tensions shifted later in the century.