This chapter will address the various peoples, polities, individuals, movements, and the social-political and economic conditions of Nigeria before the colonial era (1900). It will also go over the processes that spurred ongoing transformations in the complex patchwork of political, cultural, and religious entities that dominated what is known today as Nigeria. This chapter names five principal events as the primary catalysts for these transformations. They are the abolition of the slave trade and the switch to legitimate trade; the Sokoto Jihad; the decline and eventual collapse of the Old Oyo Empire; freed captives returning from Sierra Leone along with the arrival of missionaries; and the advent of colonial rule. These events would result in an environment of instability which gave way to new powers prompted by shifting demands from an increasingly industrialized and interconnected world. The chapter explores the social and economic shifts that resulted from these political changes and how these social and economic processes impacted the political changes in question. Finally, the chapter gives specific examples of lifestyle changes experienced by millions during this period, such as changes in clothing, religious practices, and diet.