'Within living memory' - ie a witness to the event, grandparent, etc
'Written / photographic account' - ie the event has been recorded either on paper or on film
'Other evidence' - eg archeological dig and interpretation of the results.
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Although this is a broad generalization, it is farily accurate. The 1950s were an incredible stable and thriving period for the US, as people returned from the war with higher spending power and nice suburban homes. The 60s brought a "counter culture" that tried to upset this norm.
Answer:
Maximilien Robespierre, in full Maximilien-François-Marie-Isidore de Robespierre, (born May 6, 1758, Arras, France—died July 28, 1794, Paris), radical Jacobin leader and one of the principal figures in the French Revolution.
Answer: Federalism limits government by creating two sovereign powers—the national government and state governments—thereby restraining the influence of both. Separation of powers imposes internal limits by dividing government against itself, giving different branches separate functions and forcing them to share power.