Because America was founded on a promise of freedom and the citizens of America still love the freedom and don't want communism where the people don't have freedoms.
It increased because industrialization & mass production came to replace lots of jobs. So a farmer for example was replaced by machines and so he and his family would have to move from a rural area (farm) to an urban area (city) to get work doing hard labor in factories. The size of cities also grew because at this time the railroads made getting from places easier than ever and allowed many people to move to cities. Cities were also were many companies would set up factories and workers moved their to be closer to their jobs
The correct matches are the following.
A.- Improved communications: facilitates international trade.
B.- Free Trade Policies: increases the mobility of goods and labor.
C.- Development of infrastructure: reduces distribution costs.
D.- Industrialization: helps developing countries.
These global trends in the current economy help a country to increase its foreign commerce in a secure way, reducing costs, and maximizing the efficiency of resources. For instance, free trade produces an increase in sales due to lower prices of exportation. There are no tariffs barrier between countries who have free trade agreements. That is the case of the free trade agreement between Mexico, Canada, and the United States.
