One woman from Kansas, born in the 1890s, once asked her mother about a photograph of her older siblings. Her mother explained that they had had it taken just after a classmate of one sibling had come down with the whooping cough, just in case. (They did get it, but they managed to all survive.)
During World War II, some women served as "flight nurses." They flew in on planes and then flew out the wounded men, keeping them alive. Because the planes were also used to carry troops, they could not bear the Red Cross. Flight nurses got regularly scheduled R&R breaks.
Peasants that opened up new farmland in medieval Europe were freed from serfdom when they did it. They still had duties to the lord -- such as using his ovens, his mill, his wine press -- but those were carefully distinguished from those that denoted servile status.
Extension work from the agricultural universities of the day was very big in the early twenth century in the United States, with trains and the like used to demonstrate such things as techniques to preserve milk and eggs on the way to market. Home extension clubs were considered synonmous to canning, particularly since the warm bath method of canning had just been invented and allowed canning so many more items.
Around King John's time, grants of wardships started to specify that the ward could not be disparged -- that is to say, the guardian could not arrange a marriage to a person of lower status.
The census of 1920 produced much consternation in the United States: urban residents outnumbered rural ones.
Just before the American Revolution, many women were urged not to wear even old clothing of British cloth -- to set a good example. A nine-year-old girl who was given a cup of tea by a governor and threw it out the window was held up as a exemplar.
The Dutch famine during 1944 resulted in the discovery that wheat caused celiac disease; a ward of children recovered from the lack of wheat, and relapsed immediately when the first available wheat was used to feed them.