The reconstruction act, allowed blacks to vote and hold political office. is one way government attempted to give blacks the rights of full citizenship !

the reconstruction act gave african American USA citizenship.

The reconstruction act of 1867, was drawn to provide a process for readmitting southern states into the union after the civil war, during the Johnson administration. it provided former slaves, Blacks national citizenship. the right to vote for blacks was provided by the fifteen ammendment in 1870.

d. migration

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.