Question

What does this stanza mean

They tell me thou art rash and vain,
A searcher after fame;
That thou art striving but to gain
A long-enduring name;
That thou hast nerved the Afric's hand
And steeled the Afric's heart,
To shake aloft his vengeful brand,
And rend his chain apart.

Answer 1

Sounds like someone is being told about someone else, and they're being told this person is selfish and vain, and that they are putting in a lot of work into some kind of selfish gain. This a well-known person (long enduring name). This person did something wrong to Africa/African people. I'm not entirely sure in the last two lines.