Answer:
Jaja of Opobo positioned himself as a successful merchant and a symbol of nationalists against the influence of British colonists. He blocked the access of British merchants to Opobo's palm oil supplies through monopoly trading system and taxes on British merchants' trades. He even went further and bypassed the merchants by shipping directly to the Great Britain, independently of the British middlemen.
Explanation:
Autumn would announce its arrival by (c) SIGHT
He played a key role in defeating American forces at the Siege of Detroit.