<span>Two of the major factors were the railroads and the invention of the assembly line. With the finishing of the transcontinental railroad some 30 years earlier, the US had a nation that was linked coast-to-coast and was able to transport goods in a fraction of the time it previously could. With the invention and perfection of assembly line processes, those goods could now be produced in a fraction of the time, as well.</span>
Answer:
B) To establish proper boundaries for local American Indian tribes.
Answer:
D. The rock was once in a marine environment.
Explanation:
The question says when MARINE organisms are present in a rock, meaning it was in a marine environment. Most fossils are found on land, but scientists can easily figure out of it was originally from land or marine based.
Answer:
Democracy the people elect officials to represent them communism one person controls mostly everything.
Explanation: