Which innovative product advertising technique was widely used during the American Revolution to promote patriotism and boycott British goods?

During the American Revolutionary War (1775-1783), innovative retail and marketing techniques were already being used to support military efforts. Merchants, printers, and patriots developed creative ways to promote patriotism through consumer products while boycotting British goods. This trivia explores a fascinating early example of product advertising with military significance that helped shape American identity during wartime.

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Newspaper advertisements featuring 'Liberty Trees' and 'Sons of Liberty' branding on locally-made products
Radio broadcasts announcing daily special discounts on American-made gunpowder and muskets
Door-to-door salesmen offering membership in 'Continental Army Supporter Clubs' with exclusive merchandise
Telegrams sent to households promoting 'Washington's Approved' product certification labels