allegiance

I pledge allegiance to my country. [=I promise to be loyal to my country]我发誓忠于我的国家。

He owes allegiance to them for all the help they have given him.得到他们如此多的帮助，他认为自己应该效忠于他们。

Both candidates are working hard to convince voters to switch allegiances.两位候选人都在努力说服选民们改变拥戴对象。