By the end of the 18th century British enterprise had almost entirely displaced that of other nations on the Niger coast. But the principal trade of all Europeans was still in slaves. After the abolition of the slave-trade in the 19th century palm oil formed the staple article of commerce, and the various streams which drain the Niger coast near the mouth of the great river became known as the "Oil rivers." The opening up of the interior was in the meantime promoted, chiefly by the efforts of British trav ellers and merchants. Mungo Park traced the Niger from Segu to Bussa, where he lost his life in 1805. From Bussa to the sea the course of the river was first made known in 1830 by the brothers Richard and John Lander. Maj. Dixon Denham and Capt. Hugh Clapperton entered the country now known as North ern Nigeria from the north in 1823, crossing the desert from Tripoli. Clapperton in 1826-27 made a second journey, approach ing the same territory from the Guinea coast. Dr. Barth, travel ling under the auspices of the British Government, entered the country from the north and between 1852 and 1855 made the journeys whose record still remains the principal standard work for the interior. Macgregor Laird first organized in 1832 the navigation of the River Niger from its mouth to a point above the Benue confluence. During the next 25 years expeditions were despatched into the interior and a British consul was posted at Lokoja. Possession was also taken, in 1861, of Lagos island, with the object of checking the slave traffic still being carried on in that region. But the deadly climate discouraged the first efforts of the British Government, and, after the parliamentary committee of 1865 had recommended a policy which would ren der possible the ultimate withdrawal of British official influence from the coast, the consulate of Lokoja was abandoned, but re established a few years later to meet the still steadily growing requirements of British trade upon the river.
year, 1886, the United African Company received a royal charter under the title of the Royal Niger Company. The territories which were placed by the charter under the control of the corn pany were those immediately bordering the Lower Niger in its course from the confluence at Lokoja to the sea. On the coast they extended from the Forcados to the Nun mouth of the river. Beyond the confluence European trade had not at that time penetrated to the interior.
The interior was held by powerful Mohammedan rulers who had imposed a military domination upon the indigenous races and were not prepared to open their territories to European inter course. To secure British political influence, and to preserve a possible field for future development, the Niger Company had negotiated treaties with some of the most important of these rulers, and the nominal extension of the company's territories was carried over the whole sphere of influence thus secured. The movements of Germany from the south-east, and of France from the west and north, were thus held in check, and by securing international agreements the mutual limits of the three European Powers concerned were definitely fixed. The principal treaties relating to the German frontiers were negotiated in 1886 and 1893; the Anglo-French treaties were more numerous; those of i890 and 1898, which laid down the main lines of division between French and British possessions on the northern and western frontiers of Nigeria, having been supplemented by many lesser rectifications of frontier. It was not until 1909 that the whole of the frontier between Nigeria and the French and German pos sessions had been definitely demarcated. Thus, mainly by the action of the Royal Niger Company, and with the employment of a force of 500 Hausa trained under European officers, a terri tory of vast extent, into which the chartered company itself was not able to carry either administrative or trading operations, was secured for Great Britain.