好，For the first time in the modern era, non-Hispanic Whites are officially a minority in California, amounting to a little less than half the population of the state, down from nearly three-quarters a decade ago.句子来源GMAT。请问这句话是little为代词，less than作定语修饰little吧？down from是作定语修饰little吗？还是作状语修饰amounting to呢？如题