One cause might be a mental condition called megalomania, or in the case of Idi Amin- insanity caused by syphilis. Another reason might be greed- they have stolen so much and have shifted much of it out of the country, and don't want their crimes exposed and their wealth taken away. Mubarak is an obvious example, and could never have stayed power for thirty years without the support of western powers, either.
Over consuption of electricity cause power cuts in major cities
The President has the constitutional power to grant pardons.
Unions, African Americans and Southern Democrats
Presidents don't have legislative power. Congress has legislative powers. Presidents don't make laws.
The economy
As of 2016, every major European former colonial power has suffered at least one defeat in an African State, but the question is likely referring to the ITALIAN defeat against the Ethiopians at the Battle of Adwa, which was the only major defeat of a European colonial power prior to World War II by an African country.
It can declare the presidents actions unconstitutional.
administrative power
Reactance certainly causes loss in a transmission system, but I^2R or resistance losses are greater.
the sources of the presidents power is how he relies his party members and going public meaning using the media to get public support
The answer is Party Game.
white house