Having background information about political parties and their candidates.
Knowing that your vote counts.
Keeping in mind the effects of voting for a specific candidate.
Knowing the voting system followed by the country.
:-)
B. Because the wall was built, The USA brang goods into Berlin.
B.) Pitch tents over wet ground
The best option from the list would be "World War I" since the Great migration saw the mass-movement of blacks from the South to the North, and this was mainly due to an increase in jobs due to WWI.