The correct answers to these open questions are the following.
1. What has made the U.S. So attractive to people from other nations over the years?
People from all over the world have been attracted to the many economic opportunities that the country has offered. Since the colonial American times, European people that had religious differences with the Church of England and were persecuted found an opportunity to start anew in the North American territories.
2. How did advancements in technology impact the economy of the West?
The Industrial Revolution changed the lives of people in the West. Many factories were built and modern machines of the time allowed the mass production of goods. These industries needed hands to operate the machines and offered low paid jobs to Americans and immigrants.
3. What changes did America face as a result of the Transcontinental Railway?
Many positive economic changes in that the Transcontinental Railway finally connected the East part of the United States with the Pacific Coast, allowing millions of people to travel by train and transport their goods, improving trade across the country.