Why did the growth of other European countries overseas empires impacted Britain and France

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