While you wait for an answer, just the other day I was reading this thread which contains tons of great resources on the history of coffee and answers why specifically it boomed in Seattle. Specifically check out the book mentioned and the first chapter of it linked in the third paragraph, it gives a quick overview of the entire history of coffee, including its spread to America and why coffee became patriotic.

(Mods if unflaired users are not allowed to refer to past answers my sincerest apologies)

Just wanted to provide a somewhat-shallow answer for you, since so much time has passed but I can definitely give you context.

Coffee was huge in England, once upon a time. The first coffee house opened in the 1600s and they quickly became a popular meeting spot for discussing politics, religion, philosophy, like a high-class equivalent to a tavern. Coffee houses began serving food and even offered the first food delivery services.

At the same time, tea was already in England but exclusively upper class, due to the scarcity of the imports making it ten times more expensive than coffee.

Over the next century, tea became cheaper due to the rise of the East India Tea Company, and coffeehouses saw a decline in popularity due to a number of factors, including mismanagement and lower class patrons pushing away the “enlightened” crowd. During this time, coffeehouses picked up a seedier reputation.

So, tea became cheaper, it was much easier to process and prepare, and quickly replaced coffee as the de facto caffeinated beverage among the middle class, and later, the working class. In the 18th century, tea consumption rose from 360,000 kg per year to 45 million kg per year in a span of just a decade.

I know speculation is frowned upon in this subreddit but I’ll end with a bit on the American side (and will remove if asked): given the timing, I could see tea having a lagging growth in imports to America throughout the 18th century, but in the wake of the Revolution, which would have occurred only 50-60 years after the popularity surge in England, it’s easy to imagine a cultural rejection of tea, along with an economic rejection due to the lack of connection with the East Indian Tea Company.