In the United States the unofficial beginning and ending dates of national economic expansions have been defined by an American private nonprofit research organization known as the National Bureau of Economic Research (NBER).he NBER defines an expansion as a period when economic activity rises substantially, spreads across the economy, and typically lasts for several years. During the 19th century, the United States experienced frequent boom and bust cycles.
chronologize definition: the entire process of setting up order in events based on the time occurrence for the occasions.; To arrange in historic order, as events with their dates.; establish the orderâ¦
A chronograph is another name for a watch with a stopwatch function. The buttons, or pushers, on a chronograph start, stop and reset the stopwatch. The watch tells time as usual, even while using the chronograph.