World War II helped influence the identity of the United States by bringing out the military power and having other countries, the Axis powers, recognizing it as a World power
While the rural population continued to grow in the late 1800s, the urban population was growing much more rapidly. Still, a majority of Americans lived in rural areas in 1900. Many of those Americans had settled on the plains in the 1880s.
The development around the world is measured by using several different methods. Mostly these methods include the GDP, GDP per capita, industrialization, freedom of speech, level of corruption, type of economy, availability of institutions to the people, healthcare, availability of resources etc. All of these things combined are able to provide us with a fairly accurate picture on the level of development of a particular country. Some countries are well developed, some are transitioning, while some are with very low level of development. The countries that are well developed often put effort to help the countries that are not developed, and they do this by providing finances for capital projects, making trading deals with them, sending experts in certain fields to help with the development and education.