How did the European water chestnut get to the US?

The European Water Chestnut comes from Eurasia, but it is native to North America, Australia, Holland and Canada. It is a terrible nuisance because it reduces the growth of plant population below the canopy it creates, like a huge mat floating in the water. The European Water Chestnut got to the United States because a Eurasian obviously came over and let some loose! They could also have some on their boat, which they put in an American lake. That is what I have to tell you.