They spread knowledge of medicine, mathematics, and other sciences. The hindu-arabic mathematical numerals 0-9 is still used today.
Answer:
North Atlantic Treaty Organization (NATO) and the Warsaw Pact
Explanation:
In the mid 1950's, the tensions between the communist east and capitalist west were constantly on the rise. This led to the formation of military alliances from both sides. The Western countries formed NATO, a military organization initially consisted of USA, Canada, and Western European countries. The Soviets responded adequately, and they formed the Warsaw Pact with their allies, which was also a military organization. The reason for the formation of these two organizations was to protect the interests of the member countries, be it safety, political, economical, social, or zones of influence. Both organizations were constantly pilling up more and more weaponry and were constantly increasing the armies, heavily investing in its development, equipment, and training.
The correct answer to this question is: 2, 4
Railroads allowed for the expedient movement of much needed raw goods on the front end and movement of finished goods at the back end allowing the industry to grow.
