Civilization is the establishment of culture and a system of government in a society. And due to such privilege the society enjoys it thrives and grow larger and there would be a population growth and also poverty would be present and thus slums are created due to such growth but the system didn't change to cope up with the change happening.
This depends on the system, the kind of information they need, etc...
In the most democratic countries, government sites might prove most reliable. In other, independent journalists might be better. In a way, it's almost impossible to be sure your information isn't biased.... the best is if you know who wrote it and what their agenda is: if they news is left-wing and what they report is not very left-wing, then it's perhaps reliable.
I think the most significant cause of World War one was the assassination of the Archduke Franz Ferdinand. The other causes of the war was Imperliasm, Militarism, Nationalism and Alliances that were formed.
Reconstruction lasted from 1863 to 1877, reconstruction abolished slavery and the communist. Reconstruction made the newly freed slaves have rights.