求翻译：银胶菊原产于墨西哥和美国西南部，曾于19世纪初期的十年被用来制造橡胶制品。二次世界大战期间，日军切断了来自东南亚的橡胶供应，美国农业部领导应急橡胶项目小组培育银胶菊。战争结束时，这些银胶菊已经到了收成的时候，但就在这时，联邦政府决定支持开发合成橡胶。是什么意思？

The guayule originating in Mexico and the southwestern United States, in the decade of the early 19th century and was used to make rubber products. During World War II, the Japanese cut off the supply of rubber from Southeast Asia, the U.S. Department of Agriculture led the emergency rubber project