Ask a stupid question, get a scathing answer:
Q. Is there a period after an abbreviation of a country if it is terminating a sentence? “I went to U.K..”
A.
Seriously, have you ever seen two periods in a row like that in print?
If we told you to put two periods, would you do it? Would you set your
hair on fire if CMOS said you should?
Tip from Lisa Gold, who has put me hip to the Chicago Manual of Style Online.
The Random Texan 
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