Sentence:  His father , George A. Mercer , was descended from an honored Southern family that could trace its ancestry back to one Hugh Mercer , who had emigrated from <WSD>Scotland</WSD> in 1747 . 
Meaning of the word marked with <WSD> tags:  one of the four countries that make up the United Kingdom of Great Britain and Northern Ireland; located on the northern part of the island of Great Britain; famous for bagpipes and plaids and kilts