They believed it was bad and went to any length the prevent it. (Not sure tho) Hope this helps
D. The Soviet Union and Chinese helped Korean communists gain power in the north.
Financing the Transcontinental Railroad<span>. The first </span>transcontinental railroad<span>, built between 1864 and 1869, was the greatest construction project of its era. It involved building a line from Omaha, Nebraska, to Sacramento, California, across a vast, largely unmapped territory.</span>
gunpowder
The invention of gunpowder.
This period is also known as the medieval period and is known for the various discoveries and inventions made during this age.