What were the main transportation hubs of African civilizations?
Select the best answer from the choices provided.
A. the Sahara and Kalahari Deserts
B. the Nile, Niger, Congo, and Zambezi Rivers
C.
the fertile plains and savannah of Sudan
OD. traditional paths through rainforests
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the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.

a direct vote in which an entire electorate is invited to vote on a particular proposal. this may result in the adoption of a new law.  

napoleon the third became a empire in 1873 also known as the era of the franco-prussian war.