After the development of a steam-powered locomotive in the mid-1800s, the laying of new rail lines grew quickly. national road construction came to a halt. steamship travel sharply declined in popularity. travel by steamboat was concentrated in canals.

The right answer is the laying of new rail lines grew quickly.

The first great wave of railroad building occurred in the 1850s, the most spectacular growth took place during the quarter century after the Civil War. From about thirty-five thousand miles of track in 1865, the national rail network grew to nearly two hundred thousand miles by 1897. The transcontinental rail lines led the way, and they helped populate the Great Plains and the Far West. Railroads were America’s first big business, the first magnet for the great financial market known as Wall Street in New York City, and the first industry to develop a large-scale management bureaucracy.

d: social contract theory

the topic i chose to write about was " why scuba diving is so popular". the topic is suitable for the audience because it is the easiest to develop and explain, it can be explained in a simpler more conversational manner, it does not require the use of too many technical words, and the final reason for selecting this topic is that it is the one most people can relate to, you might not know too much about scuba diving, but you could probably agree that it is very popular. the purpose of the writing about this topic is to convince more people about the benefits both for the body and the mind that   scuba diving can have on a person. it can you keep fit since it requires a lot of energy when swimming underwater; it also you relax because you forget about the world when you are underwater being mesmerized by the underwater world. i would write this paper in the summer, a perfect time to give scuba diving a try if a person has not done it yet.