For our present purposes, the most important of these specific powers are the power to regulate interstate commerce, the power to tax and spend, the power to enter into treaties, and the power to regulate the use of public lands.

• 为了我们当前的目标，这些具体权力中最为重要的是约束州际商业的权力、税收与支付权、缔结条约权和管理公共土地使用权。