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If the postal card was mailed from a location in Colombia such that it left the country by a port of the Pacific Ocean, it would have had to cross the continental divide in Panama.
The Panama Railroad would have been in operation for nearly half a century when this postcard was mailed. The item would have been picked up in Panama City and taken by train to Aspinwall (this city was later renamed Colon), where it was put on board a ship bound for the USA (New Orleans, Louisiana possibly).
http://www.panamarailroad.org/Here is where I am less likely to be correct, but I might surmise . . . From the Big Easy the mail might have been taken by steamer up the Mississippi, and then up the Ohio River to Pittsburgh, Pennsylvania.
At Pittsburgh, it might have traveled by the Pennsylvania state canal system north to Erie, Pennsylvania, and then by Erie Canal to the Hudson River, and down the Hudson to NYC.
http://www.latinamericanstudies.org...s-canals.jpg
http://www.captainjohn.org/sitebuil...-627x436.jpg