<span>The introduction of new power sources</span>
Answer: B ) The arms race
Explanation: The nuclear arms race was an arms race competition for supremacy in nuclear warfare between the United States, the Soviet Union, and their respective allies during the Cold War. During this very period, in addition to the American and Soviet nuclear stockpiles, other countries developed nuclear weapons, though none engaged in warhead production on nearly the same scale as the two superpowers.
Answer:
The Gilded Age” is the term used to describe the tumultuous years between the Civil War and During this era, America became more prosperous and saw corrupt industrialists, bankers and politicians enjoyed extraordinary wealth This enormous railroad expansion resulted in rail companies
