Answer : Option A) The Bessemer process increased the use of steel in many industries.
Option C) Electricity meant that larger and more sophisticated manufacturing machines could be developed.
Explanation : The impact of technologies to the gilded age which was from 1870 to 1900
where the first point applicable is;
i) The Bessemer process increased the use of steel in many industries. The Bessemer process which had been discovered in the 1850's actually brought the special cutting-edge solutions to the production of steel which had a fruitful impact on industries.
ii) Electricity meant that larger and more sophisticated manufacturing machines could be developed. The process of mass production using electricity evolved even more and helped development of new technologies.
The battle of Antietam was known as the bloodiest war that happened in America. Here, the <span>Union won the battle which led to the Emancipation Proclamation. The proclamation </span><span>was given by President Lincoln who declared the freedom of slaves in the South. </span><span>This immediately helped the slaves escape the Confederates and go to the Union based areas.</span>
The French<span> decided to back the U.S. in its military efforts until the U.S. had full independence from Great Britain.</span>
"If the ruling dynasty was wealthy, it would keep the Mandate of Heaven" is the best answer from the list, but it should be noted this was not always the case.
The areas with the federalist majority were mostly found along the Atlantic seacoast as these areas had much more trade and merchants.
Moreover, most of the first cities to be settled, were on the Atlantic coast and because of this, the biggest part of the population lived in those cities when the federalist party first formed.