During Monday’s inauguration, Donald Trump repeated his threat to retake the Panama Canal. The United States controlled the waterway since the early 20th century, but in 1977 President Jimmy Carter signed a landmark treaty to give Panama control of the canal.

The answer is simple: there is no greater or more idealistic symbol of U.S. power in the world than the Panama Canal. As Trump seeks a way to enhance the country's power in the world, leaning on imagery regarding the Panama Canal provides just the right message.

More than 100 years after the construction of the engineering marvel that linked the Atlantic and Pacific oceans — and 25 years after the canal was returned to Panama by the US — the Panama Canal faces renewed intimidation from US President Donald Trump.