The best and most correct answer among the choices provided by your question is the second choice or letter B.
The use of submarines during World War I had made <span>naval battles the key battles of the war.</span>
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They faced challenges such as how to accommodate states that had basically ruled. How to create a strong central government without giving too much power to one group & how to give small & large states equal representation.
The speech was addressed to party members, army officers and officials. The main point was the victory against Germany, where it was proved that the Soviet social system has won, the capacity of the Red Army was demonstrated, clearing all the existing doubts, in its speech demonstrates an ideological hardening, which was interpreted as an alarm of war. A point of support was to describe the causes of the war, stating that it was not caused by Hitler but by the functioning of the capitalist system.
<span>The Union (North) won the battle over the Confederacy (South).
About 7,500 soldiers were killed from both sides of the armies.
The site of the battle is </span><span>where Lincoln gave the Gettysburg Address.</span>