Why is cheatgrass only considered a threat in the Western US?

Cheatgrass is primarily a threat in the Western US due to the region's unique climate and ecological conditions, which favor its rapid growth and proliferation. The dry, fire-prone landscapes of the West allow cheatgrass to outcompete native vegetation, especially after disturbances like wildfires. Additionally, its early growth cycle and ability to produce vast amounts of seeds enable it to dominate ecosystems, leading to reduced biodiversity and altered fire regimes. In contrast, other regions have different climatic and ecological characteristics that limit cheatgrass's establishment and impact.