Most worthless US territorial acquisition

Futurist

Ad Honoris
May 2014
21,992
SoCal
What US territorial acquisition do you believe was the most worthless, and why?
 

Kotromanic

Ad Honorem
Dec 2011
4,980
Iowa USA
100 percent based on subjective experience, I am going with Monroe's (JQ Adams Sec'y of State) gift: Florida.