If you have some evidence that no American shipowners became poorer because of patriotism, now is the time to present it.
Or if you have evidence that American shipholders became poorer because of patriotism, this is the time to present it.
I’m almost tempted to take you up on that suggestion, but since you are deliberately eliding the count from “no American”, why bother?
Most of it was already disappearing though. Agricultural income in the UK dropped by more than half in the 1800s. UK farmers couldn’t compete with Americans and others growing massive amounts of wheat and huge cattle herds. There was a collapse in crop prices which only got worse. WWI was a blip because suddenly crops were worth more. Rectories’ income was based on agricultural tithes, which is why being an English curate was no longer a path to wealth (or often even a comfortable living) by the 20th century.