The correct answer is: "For refusing U.S. offer for canal construction "
At a dinner in Panama, in 1907, on an official visit by US Senator Duncan E. McKinlay, he held a conversation with the government minister of Panama, Tomás Arias, and asked his opinion on the reasons why the Herrán-Hay treaty it had been rejected after it had been tentatively agreed to by the Colombian authorities.
After the rejection of the treaty for the construction of the Panama Canal, the US worked for Panama to become independent from Colombia.