Lewis used many informative terms in his journal, such as directions, measurements, and geographic features. Why were these words important to include?

According to this chart, it can be deduced that, in the period 1881-1890, a) people were no longer leaving countries not northern europe b) asian people maintain their level of immigration to the us c) there was a sharp decrease in immigration from southern europe than in the previous 10 years d) there was a drastic increase in immigration from central and eastern europe than in the previous years