La Palma collapses in 1777

Suppose that the predictions about the collapse of the island of La Palma after a big eruption of the Cumbre Vieja volcano are correct. But, instead of tomorrow, the catastrophe occurs in 1777. Morocco, Portugal, Spain, France, Britain and most of the American colonies are hit by a giant megatsunami... How can this affect the American Revolution?

I'll put a pic of the Lisbon tsunami (1755) to get an idea... :D