Final answer:
Ghana played a significant role in the establishment of the OAU by being a symbol of African nationalism and liberation, inspiring other countries in the decolonization movement.
Step-by-step explanation:
Ghana played a significant role in the establishment of the Organisation of African Unity (OAU). The OAU was formed in the mid-1990s with the aim of promoting unity and solidarity among African countries. Although Ghana was not directly involved in the negotiation talks for the OAU formation, it played a crucial role in the decolonization movement in Africa, which paved the way for the OAU. Ghana gained independence in 1957 and became a symbol of African nationalism and liberation, inspiring other African countries to seek independence from colonial rule.