Banjul

City · 1816 CE · in North Africa

Capital of Republic of The Gambia (1967–today).

Wiesbaden (c. 1816 CE): Capital of Duchy of Nassau (1816–1865).
Piacenza (c. 1815 CE): Capital of Duchy of Parma and Piacenza (1815–1859).
Parma (c. 1815 CE): Capital of Duchy of Parma and Piacenza (1815–1859).
Modena (c. 1815 CE): Capital of Duchy of Modena and Reggio (1815–1859).
Montgomery (1817 CE): Capital of Confederate States of America (1861–1861).
Grozny (1818 CE): Capital of Chechen Republic (1993–2005).
Kailua-Kona (c. 1812 CE): Capital of Kingdom of Hawaï'i (1812–1820).
Meiningen (c. 1820 CE): Capital of Saxe-Meiningen (1820–1870).
Sankt Wendel (c. 1820 CE): Capital of Principality of Lichtenberg (1820–1827).
Bagé (1811 CE): Capital of Riograndense Republic (1836–1845).

Around the same time and place

House of Slaves, Gorée (c. 1776 CE): House on Gorée Island off Dakar built around 1776, now a museum and memorial to the Atlantic slave trade; its historical role as a slave-shipping point is debated.
Founding of Liberia (1822 CE): The American Colonization Society began settling freed African Americans at Cape Mesurado (Monrovia) in 1822; Liberia declared independence in 1847.
Monrovia (1822 CE): Capital of Republic of Liberia (1848–today).
Samori Ture (c. 1828 CE – 1900 CE): Founder of the Wassoulou Empire in West Africa who resisted French colonial conquest for nearly two decades before his capture in 1898.
Praia (1858 CE): Capital of Republic of Cabo Verde (1976–today).
Freetown (1792 CE): Founded in 1792 as a settlement for formerly enslaved Black Loyalists from Nova Scotia; capital of Sierra Leone.
Mungo Park’s journey to the Niger (1795–1797 CE): The Scottish surgeon Mungo Park travelled inland from the Gambia River and in 1796 reached the Niger at Ségou, confirming that the river flows eastward.