Most European countries were angered with the Monroe Doctrine the United States implemented especially the countries and empires part of the Holy Alliance after the Napoleonic war. But due to insufficient power and naval forces to implement the doctrine most countries disregard the threat.
The powerful king that united ancient egypt is : Narmer.
Before the reign of narmer, Egypt was divided into lower part and upper part Kingdom. Narmer managed to unified these two kingdoms and became the first king who rule the united ancient egypt
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One common social structure among ethnic groups in sub-Saharan Africa is segmentary lineage organisation. Segmentary lineage societies are characterised by the foremost importance of kin relationships in determining individuals' social and political allegiances, as well as their patterns of residence.