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¦
WeissenbacherâZweymuller syndrome (WZS), also called Pierre-Robin syndrome with fetal chondrodysplasia, is an autosomal recessive congenital disorder, linked to mutations (955 gly glu) in the COL11A2 gene (located on chromosomal position 6p21.3), which codes for the Î± 2 strand of collagen type XI.