Better transportation affected the growth and urbanization of cities by allowing more people to travel, which in turn led to more people settling down in these cities to start a new life.
Better communication affected the growth and urbanization of cities by allowing people to understand each other better, which led to more people coming to these cities and socializing, which improved economy. People who can communicate can perform business better and communicate outside of the city, drawing more people there.
The phrase which explains what was significant about the Declaration of Independence was that it set up a government system without any leaders. This was sort of a system of emancipation from the British government for the thirteen colonies and this document essentially made the United States free from the rule of the British monarchy.
