why do george and his family want to leaved the country to live in liberia, africa? how does he thinks he can combat slavery in america by relocating to africa?

George want to establish a colony of free slaves in Liberia. This was a popular political idea (during Stowe's time), of a separate nation for the freed slaves in Africa. George Harris's letter reveals that an independent nation in Africa would give these individuals the agency and respect they lacked in the United States, even as free men in the north. However, Stowe still emphasizes the idea, as she did previously through the character of Miss Ophelia, that free slaves should be welcome in the United States and that northerners should work to educate them so that they will be self-sufficient wherever they may choose to live.