What plant was introduced to prevent erosion?

Location? I don't recall hearing about any plants being introduced anywhere to prevent erosion. To the best of my knowledge, grasses, native or tame, are the best plants to prevent erosion, next to trees and shrubs.

Answer:

In the 1930s (During the Great Depression) the American Soil Conservation Service felt that kudzu would be a useful "tool"for erosion control. Young men planted kudzu through the Civilian Conservation Corps. Farmers were encourages (and paid a small amount per acre) to plant fields of the vines in the 1940s.

Like many other invasive species the plant became more of a problem than a solution.