Why was Mujibur Rahman known as bangabandhu?

Mujibur Rahman was known as "Bangabandhu," which means "Friend of Bengal," due to his pivotal role in advocating for the rights of Bengalis in East Pakistan (now Bangladesh). His leadership during the struggle for autonomy and independence, particularly his historic 1970 speech calling for self-determination, endeared him to the people. He became the founding leader of Bangladesh and is celebrated for his contributions to the nation's liberation, earning him this honorary title. His legacy as a champion of Bengali identity and rights solidified his status as a beloved figure in Bangladesh's history.