Where did the cheatgrass come from?

Cheatgrass, scientifically known as Bromus tectorum, is native to Eurasia, particularly in regions like the Mediterranean and parts of Central Asia. It was introduced to North America in the late 19th century, likely through contaminated crop seeds or ballast in ships. The grass has since spread widely across the western United States, thriving in disturbed areas and altering local ecosystems. Its rapid growth and ability to outcompete native vegetation have made it a significant invasive species.