Statistics for occurrence #1 of “John W. Mackay” in entry bennett-james-gordon of Harper's Encyclopedia of United States History:

...son. James Gordon Bennett, Jr., who was born in New York City, May 10, 1841; fitted out the Jeannette polar expedition; sent Henry M. Stanley in search of Dr. Livingstone in Africa; constructed, with John W. Mackay , a new cable between America and Europe; and greatly promoted international yachting.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
† John W. Mackay 8 8 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.