linguistic:paraphrasing
Colonial era (1800–1961)

The colonial era saw Sierra Leone evolving under British rule, with a unique settlement pattern composed of displaced Africans following the abolition of the slave trade. Sierra Leone developed as an educational center in West Africa, with the establishment of Fourah Bay College in 1827, attracting English-speaking Africans from across the region.

The settlement of Sierra Leone in the 1800s was unique in that the population was composed of displaced Africans, brought to the colony after the British abolition of the slave trade in 1807. Upon arrival in Sierra Leone, each recaptive was given a registration number, and information on their physical qualities would be entered into the Register of Liberated Africans. Often documentation would be subjective and result in inaccurate entries, making them difficult to track. Differences between the Register of Liberated Africans of 1808 and the List of Captured Negroes of 1812 (which emulated the 1808 document) revealed disparities in the entries, specifically in the names; many recaptives decided to change their given names to anglicised versions which contributed to the difficulty in tracking them after they arrived.

In the early 19th century, Freetown served as the residence of the British colonial governor of the region, who also administered the Gold Coast (now Ghana) and the Gambia settlements. Sierra Leone developed as the educational centre of British West Africa. The British established Fourah Bay College in 1827, which became a magnet for English-speaking Africans on the West Coast. For more than a century, it was the only European-style university in west Sub-Saharan Africa. Samuel Ajayi Crowther was the first student to be enrolled. Fourah Bay College soon drew Creoles/Krio people and other Africans seeking higher education in British West Africa. These included Nigerians, Ghanaians, Ivorians and others, especially in the fields of theology and education. Freetown was known as the " Athens of Africa" due to the number of excellent schools in Freetown and surrounding areas.

The British interacted mostly with the Krio people in Freetown, who did most of the trading with the indigenous peoples of the interior. Educated Krio people held numerous positions in the colonial government, giving them status and well-paying positions. Following the Berlin Conference of 1884–85, the British decided they needed to establish more dominion over the inland areas, to satisfy what was described by the European powers as "effective occupation". In 1896 it annexed these areas, declaring them the Sierra Leone Protectorate. With this change, the British began to expand their administration in the region, recruiting British citizens to posts and pushing Krio people out of positions in government and even the desirable residential areas in Freetown.

During the British annexation in Sierra Leone, chiefs in the north and south of the country resisted the "hut tax" imposed by the colonial administrators. In the north, there was a Limba chief named Almamy Suluku fighting to protect his territory, while using diplomacy to trick the protectorate administrators, and sending fighters to assist Bai Bureh, a prominent Temne chief in Kasseh who was fighting against the "hut tax". The war was later known as the Hut Tax War of 1898.

Madam Yoko (c. 1849 –1906) was a woman of culture and ambition. She employed her capacity for friendly communications to persuade the British to give her control of the Kpaa Mende chiefdom. She used diplomacy to communicate with local chiefs who did not trust her friendship with the British. Because Madam Yoko supported the British, some sub-chiefs rebelled, causing Yoko to take refuge in the police barracks. For her loyalty, she was awarded a silver medal by Queen Victoria. Until 1906, Madam Yoko ruled as a paramount chief in the new British Protectorate.

The British annexation of the Protectorate interfered with the sovereignty of indigenous chiefs. They designated chiefs as units of local government, rather than dealing with them individually as had been the previous practice. They did not maintain relationships even with longstanding allies, such as Bai Bureh, who was later unfairly portrayed as a prime instigator of the Hut Tax War.

Colonel Frederic Cardew, military governor of the Protectorate, in 1898 established a new tax on dwellings and demanded that the chiefs use their people to maintain roads. The taxes were often higher than the value of the dwellings, and 24 chiefs signed a petition to Cardew, stating how destructive this was; their people could not afford to take time off from their subsistence agriculture. They resisted payment of taxes, tensions over the new colonial requirements and the administration's suspicions towards the chiefs, led to the Hut Tax. The British fired first; the northern front of mainly Temne people was led by Bai Bureh. The southern front, consisting mostly of Mende people, entered the conflict somewhat later, for other reasons.

For several months, Bureh's fighters had the advantage over the vastly more powerful British forces but both sides suffered hundreds of fatalities. Bureh surrendered on 11 November 1898 to end the destruction of his people's territory and dwellings. Although the British government recommended leniency, Cardew insisted on sending the chief and two allies into exile in the Gold Coast; his government hanged 96 of the chief's warriors. Bureh was allowed to return in 1905, when he resumed his chieftaincy of Kasseh. The defeat of the Temne and Mende in the Hut Tax war ended mass resistance to the Protectorate and colonial government, but intermittent rioting and labour unrest continued throughout the colonial period. Riots in 1955 and 1956 involved "tens of thousands" of Sierra Leoneans in the Protectorate.

Domestic slavery, which continued to be practised by local African elites, was abolished in 1928. A notable event in 1935 was the granting of a monopoly on mineral mining to the Sierra Leone Selection Trust, run by De Beers. The monopoly was scheduled to last 98 years. Mining of diamonds in the east and other minerals expanded, drawing labourers there from other parts of the country.

In 1924, the UK government divided the administration of Sierra Leone into Colony and Protectorate, with different political systems for each. The Colony was Freetown and its coastal area; the Protectorate was defined as the hinterland areas dominated by local chiefs. Antagonism between the two entities escalated to a heated debate in 1947, when proposals were introduced to provide for a single political system for both the Colony and the Protectorate. Most proposals came from leaders of the Protectorate, whose population far outnumbered that in the colony. The Krios, led by Isaac Wallace-Johnson, opposed the proposals, as they would have resulted in reducing the political power of the Krios in the Colony.

In 1951, Lamina Sankoh (born:Etheldred Jones) collaborated with educated protectorate leaders from different groups, including Sir Milton Margai, Siaka Stevens, Mohamed Sanusi Mustapha, John Karefa-Smart, Kande Bureh, Sir Albert Margai, Amadu Wurie and Sir Banja Tejan-Sie joined together with the powerful paramount chiefs in the protectorate to form the Sierra Leone People's Party or SLPP as the party of the Protectorate. The SLPP leadership, led by Sir Milton Margai, negotiated with the British and the educated Krio-dominated colony based in Freetown to achieve independence. Owing to the astute politics of Milton Margai, the educated Protectorate elites were able to join forces with the paramount chiefs in the face of Krio intransigence. Later, Margai used the same skills to win over opposition leaders and moderate Krio elements to achieve independence from the UK.

In November 1951, Margai oversaw the drafting of a new constitution, which united the separate Colonial and Protectorate legislatures and provided a framework for decolonisation. In 1953, Sierra Leone was granted local ministerial powers and Margai was elected Chief Minister of Sierra Leone. The new constitution ensured Sierra Leone had a parliamentary system within the Commonwealth of Nations. In May 1957, Sierra Leone held its first parliamentary election. The SLPP, which was then the most popular political party in the colony of Sierra Leone as well as being supported by the powerful paramount chiefs in the provinces, won the most seats in Parliament and Margai was re-elected as Chief Minister by a landslide.