What is a written study of the past that is based on a primary source

A written study of the past that is based on a primary source is called a secondary source

A newspaper article from that time or a piece of evidence like a fossil

Economic success prussia had a very strong economy, partly due to the success of the zollverein. stronger prussian army king wilhelm wanted to build a bigger, stronger army but was blocked by the prussian landtag (parliament).-credits to google for putting answer -credits to slideshare for making answer-credits to me for putting answer on brain.ly