Answer:
Bác đi năm 21 tuổi
Explanation:
Bác rời cảng Nhà Rồng năm 1911. Bác sinh năm 1890. Bác đi năm 1911 - 1890 = 21 tuổi
By expanding its territories and improving its government.
This is a tricky question. All starting peoples had to hunt and gather food. However, this question asks for a civilization. A generalization answer would be foraging cultures, such as the <span>Dobe Ju'hoansi group in Africa or pastoral societies. </span>