A vast network of roads and trade routes.
Hope that answered your question! :)
Answer:
By the end of the 1920's buying started to slow down. When stores that had huge amounts of goods stopped ordering from factories, the factories had to cut back. Large amounts of factory workers were laid off even before the stock market crashed. When the crash finally come, many more people lost their jobs and savings
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The population declined. Many Eastern Europeans were murdered. Among them Slavs, Jews, Gypsies, etc.
New evidence is discovered & Oversights and errors are corrected
Thats what i personally think because new opinions have to be backed with evidence, while if a piece of evidence is lost or stolen, it doesn't change the arguments because even though it is lost or stolen, there ought to be copies of the original object, but im not sure about new technology being applied to evidence, but it can go either or, its a 50/50 because new technology can enhance historical discoveries, or find new ones, but applying new technology as evidence has to be backed up with facts as to why it should be applied
