The correct answer is A. Technological advances such as s<em>team power, air brakes, automatica lubricators and steel tracks</em> have affected the railroads very positively, since it has made it possible that the rail network could become a safer, more efficient and more reliable means of transportation for goods.
All the nations(for example Europe) was included in the Great War. The Civil War only included the Union and the Confederate states.
The Song Dynasty practiced Buddhism whereas the Tang banned the religion and persecuted those who followed it during the later time of their ruling. The Tang Dynasty also had expanded their empire and even reformed civil service. The Tang expanded and conserved their power by establishing tributary states. They had a stronger more powerful military when compared to the Song. The Song Dynasty ruled a smaller empire during their time that primarily relied on sea power. Their military power was weaker than what the Tang Dynasty’s was.
Answer:Two inventors who changed agriculture in the 1800s were John Deere and Cyrus McCormick. In 1837, Deere built the first steel plow
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