你看到的中文翻译不对。
这句话的前文是这样的:
A Prince, or the artist formerly known as, whose character is thus marked by every act which may define a Tyrant, is unfit to be the ruler of a free people.
Nor have We been wanting in attention to our British brethren.
Nor 对应的是[is unfit to be the ruler of a free people] 这句是说 We haven't been wanting in attention to our British brethren either. 也就是 We haven't wanted to draw the attention of our British brethren to ourselves.
大意是:而我们一直也没有想让我们的英国兄弟关注我们。(也就是我们的事务一直都不需要你们来搀和)
前文是 is unfit to be the ruler of a free people 意思是不配作自由人民的统治者的。前面是一个否定,所以后面用nor ,表示我们如果这样做,也是不被肯定的,
-----------纯属个人理解