WAEC - Geography (1998 - No. 17)
Trade among west African countries is less developed mainly because
they were ruled by different colonial powers which created a barrier to communication
the products of one country are basically similar to those of the others
there are no international railway lines to transport the bulky items of trade across the borders
of ethnic sentiments of people in one country against the other
no west African country has surpluses of commodities to export to the other countries