南美各国的经济政策差异很大。

The economic policies vary significantly among the South American ___states.

加拿大是北大西洋公约组织的创始成员国之一。

Canada is a founding ___state of the North Atlantic Treaty Organization.

联邦政府已实施了新的环境保护法规。

The federal ___state has implemented new regulations on environmental protection.