Who ever heard of the Liberty Pole?

So, what is the Liberty Pole?   How did I miss this in a series of social studies/history courses from 1st grade to graduate school?  I must have taken a personal day on the day the Liberty Pole was discussed.   Of course, no surprise that violence is depicted in a stamp honoring the good ole' USA.  Admittedly, we were at war with England, and last I checked, violence against humanity is part of the war thing.  The liberty pole itself in this stamp is hard to distinguish, but it is clearly shadowed in the background.

 A Liberty pole is a tall wooden pole, often used as a type of flagstaff, planted in the ground, which may be surmounted by an ensign or a liberty cap 

A liberty pole was often erected in town squares in the years before and during the American Revolution (Newport, RI, Concord MA, Savannah, GA, New York City, NY, Caughnawaga, NY). An often violent struggle over Liberty Poles erected by the Sons of Liberty in New York City (relating to the Battle of Golden Hill) and periodically destroyed by British authorities (only to be replaced by the Sons with new poles) raged for 10 years: from the repeal of the Stamp Act in 1766 until the occupation of the city by British troops after the Battle of Long Island in 1776.[1] The liberty pole in New York City was crowned with a gilt vane bearing the single word, "Liberty".

When an ensign was raised (usually red) on a Liberty Pole, it would be a calling for the Sons of Liberty or townspeople to meet and vent or express their views regarding British rule. The pole was known to be a symbol of dissent against Great Britain. The symbol is also apparent in many seals and coat of arms as a sign of liberty, freedom, and independence.

During the Whiskey Rebellion, locals in western Pennsylvania would erect poles along the roads or in town centers as a protest against the federal government's tax on distilled spirits, and evoking the spirit embodied by the Liberty Poles of decades earlier.

(compliments to google and wikipedia for the info above)

So here we have then is a stamp from Grenada, probably 1976 edition celebrating 200 year anniversary of American Revolution. So be it. I never heard of Grenada until 1983 when on my honeymoon, I was staying in a downtown Washington DC hotel during the US invasion of Grenada. There was a tenseness in the city, helicopters flying about. Gail and I were watching this unfold on television between what I assume were honeymoon moments, not that I specifically remember.

So further research indicates we invaded Grenada in response to a military coup that overthrew the government, that apparently, (ahem), we, the good ole' US of A thought they should have. Just doing the USA thing. The invasion was not well received around the world, but what else is new?  Invasions of any kind often do bring about that level of response.