What did Jacob Riis do

Jacob Riis, in full Jacob August Riis, (born May 3, 1849,  Denmark—died May 26, 1914, Barre, Massachusetts, U.S.), American newspaper reporter, social reformer, and photographer who, with his book How the Other Half Lives (1890), shocked the conscience of his readers with factual descriptions of slum conditions in New York City.

Explanation:  

shang dynasty

western zhou (ca. 1046-771 bce)

eastern zhou (ca. 771-256 bce)

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.