Why was it called a world war if every country in the world was not involved?

It's a war for control of the world. ... The Americans, on the other hand, in 1914-17 usually called it the European War. Once the United States joined the war, of course, the American media could no longer refer to it as a European war: so it became the World War. That was the first large-scale use of the term in English.

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.

answergeosphere;