As a child, I always heard that it was everywhere because the roots grow six feet deep and it can grow back from the roots. A quick google trying to confirm that suggests it grows twelve feet deep and is edible, among other things.

It was everywhere where I grew up, especially covering the ditches, etc alongside highways.

http://www.eattheweeds.com/kudzu-pueraria-montana-var-lobata...

https://science.howstuffworks.com/life/botany/kudzu1.htm

https://www.freeplants.com/kudzu.html

https://www.smithsonianmag.com/science-nature/true-story-kud...