The correct option is: "Rapid industrialization"
The twentieth century was characterized by advances in technology, medicine and science; the end of slavery in the so-called underdeveloped countries; the liberation of women in most of the Western countries; but more than anything because of the growing development of the industry, converting several countries, including the United States, into world powers.
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 information found by Lewis and Clark showed many new places to settle, what the new land was like, and what could be accomplished in those areas. They found more land to farm and build homes. They also found some of the major rivers and landmarks of today.
