I agree the odd’s of an impacting USA tsunami are remote however there's enough evidence via observation to say the chances are increasing substantially.
Scientists have pretty much agreed that the entire northern coast of the island of Crete was wiped out by a major tsunami circa 1500 BC. The source? The major eruption of the Thera volcano on Santorini, which collapsed a huge portion of the island into the Aegean Sea and triggered of a huge tsunami that not only wiped out northern Crete, but possibly much the coastlines along the eastern Mediterranean.
The major fear is that if this volcano erupts in a big way and a much of the mountain slides into the sea, we could be seeing waves over 200 feet high along the African continent shore closest to the Canary Islands, the city of Lisbon would be threatened with waves over 100 feet high, and the entire US East Coast could face a tsunami about 25-28 feet high, threatening millions of lives and potentially costing over US$10 TRILLION in damages.