Answer:
the transcontinental railroads were built all around the US and were used for trade and to transport goods all over the place
An 8 year old girl had to walk through a dangerous area to attend an African American school each day.
The science of adjusting environments, tasks, or procedures to fit the individual is ERGONOMICS. In other words, it is also defined as the study of a worker's efficiency in a workplace and how this efficiency can be improved together with the well-being of the worker.
Answer: The United States emerged as a world power; Cuba gained independence from Spain; the United States gained possession of the Philippines, Guam, and Puerto Rico.