Brooks Adams in The Spanish-American War
Brooks Adams (1848–1927) was the grandson of President John Quincy Adams. As a historian, he's best known for his study of the American economy and his warnings concerning the rapid growth of cities.
In 1902, Brooks Adams wrote The New Empire, which predicted the rise of the U.S. as an economic power that would soon "outweigh any single empire, if not all empires combined.