Reference books are an excellent place to start looking for background information and historical context.
From Oxford University Press: "Very Short Introductions offer concise and original introductions to a wide range of subjects. Our expert authors combine facts, analysis, new insights, and enthusiasm to make often challenging topics highly readable to develop your core knowledge." The short books in this series provide an excellent overview of broad topics. They books are located near the main desk in the library and their call numbers have a prefix of BIC so you know where to look for them.