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.
D. Mayan civilization of Mexico and Central America
Answer:
There were 4 major causes (actually) that led to the Great Depression, which were:
-the stock market crash in 1929
-bank failures (similar to the one in 2008, but I'm just nerding out at this point)
-over-production
-drought.
Explanation:
Falcon Security is Iraqi-owned and operated and the largest registered security company in Iraq. The company has branch offices in Kirkuk, Basra and Erbil and a corporate head office in Baghdad. The bargaining power of customers is the strongest competitive force faced by the company.