As opposed to the ancestors Tocqueville compares us to, we do not know the people with whom we have to do, in either the economic or the political sphere.
与托克维尔将我们与之比较的祖先不同,我们不认识我们必须与之打交道的人,无论是在经济领域还是政治领域。
"with whom we have to do" 修饰先行词 "the people",说明"我们与之打交道的人"。关系词 "whom" 与前置介词 "with" 构成介词宾语,整个从句限定 "people",没有逗号隔开,所以是限制性定语从句。