European nations came together at the
order to draw boundaries for the African colonies. These later
became the various African nations political borders.

Berlin Conference

Explanation:

Berlin Conference of 1884–1885 Meeting at which the major European powers negotiated and formalized claims to territory in Africa; also called the Berlin West Africa Conference.

source:  oxford reference

explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali

in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.