What made many people in road island colony rich long time ago

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.

Who gave the famous "i have a dream" speech at the march on washington?

Decide which statement best reflects a proper attitude on the first day of work.