加拿大是一个由省份和地区组成的联邦。

Canada is a ___federation of provinces and territories.

在南斯拉夫，体育运动是促进整个联邦稳定的重要因素。

In Yugoslavia, sports was an important factor contributing to the overall stability of the ___federation.

欧盟可以被视为一个由独立国家组成的联邦。

The European Union can be considered a ___federation of independent nations.