What was Francesco Petrarch famous for?

Before tuberculosis was understood to be a communicable disease, and before the discovery of antibiotics to treat it, a major outbreak could kill or cripple a significant portion of a nation’s labor force. how would such an event affect the economy? illustrate the effect by dragging to shift either the aggregate demand curve or the long-run aggregate supply curve.

What role did radio free europe play in western countries' cold warstrategy?

What did justice brown’s verdict in plessy v. ferguson state?