Which of the effects of the printing press was the most historically impactful?

In italy, the distance between milan in the north and palermo,sicily, in the south is about 550 miles. in the united states, the distance betweenboston, massachusetts, and savannah, georgia, is about 900 miles. do you think the american revolutionaries of 1776 in the 13 colonies faced some of the same challenges as the patriots who struggled for italian unity in the 1860s?  

How was george washington able to defeat the british in the battle of trenton and princeton

Look at the graph. where p is price and q is quantity, what might cause a move from b to a?