How might the use of propaganda in developed countries like Canada & the U. S. affect our understanding of geopolitical patterns & events?

Propaganda is information that is not impartial and used primarily to influence an audience and further an agenda, often by presenting facts selectively (perhaps lying by omission) to encourage a particular synthesis, or using loaded messages to produce an emotional rather than a rational response to the information presented. The term propaganda has acquired a strongly negative connotation by association with its most manipulative and jingoistic examples.