Rank the following innovations in which you believe is the most important: electricity, dynamo, automobile, airplane, internal combustion engine, radio, telephone, telegraph, interchangeable parts, and the assembly line.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.