The Panic of 1893: just in time to ruin plans for the Columbian Exposition, I suppose. Reasons:
One of the causes for the Panic of 1893 can be traced back to Argentina. Investment was encouraged by the Argentinean agent bank, Baring Brothers. However, a failure in the wheat crop and a coup in Buenos Aires ended further investments. This shock started a run on gold in the U.S. Treasury, as investors were cashing in their investments.
And this popped the railroad stock bubble.
Controversy with Great Britain over Venezuela? Sounds so quaint. Wikipedia:
A tribunal convened in Paris in 1898 to decide the matter, and in 1899 awarded the bulk of the disputed territory to British Guiana. By standing with a Latin American nation against the encroachment of a colonial power, Cleveland improved relations with the United States' southern neighbors, but the cordial manner in which the negotiations were conducted also made for good relations with Britain.
Sounds like it worked out well for all, but the effects of the Panic would linger for half a decade.