"economic factors led to more change between 1550 and 1900 than any other". how far do you agree? i don't need a complete answer, just some examples :)

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?  

The globe, the book of mathematics, and the scientific instruments in this painting demonstrate the renaissance interest in

How did louis sullivan and william jenney change the face of american cities in the late 1800s