Being one who has experienced many problems with typographical errors in my lifetime, I wouldn't make too much of one.
But a typo in the American History curriculum of the local public schools is too good to ignore.
Students in the 11th grade spend weeks 16 and 17 studying the Progressive Era. Anyone familiar with the extent of liberal (progressive) influence in the public schools will appreciate the need for this area of study.
An essential question: "How was imperialism a continuation of Manifesto Destiny and how was it different?"
Would that be the destiny of the Communist Manifesto? They were a pretty progressive bunch.