Answer:
Right choice:
B. Putting interests of a particular section or region above those of the nation…this refers to the growing cultural and economic differences between the North and South in the years leading up to the Civil War.
Explanation:
The most divisive issue was slavery, free states versus slavery states, abolitionists of the North against the pro-slavery establishment in the South. The two parts of the USA had different economic systems, with the South being agrarian and the North being industrial. There were major divergent commercial and business interests, too.
Answer:
The second industrial revolution began whith the adoption of new steel production techniques. Thanks to these techniques, steel became cheaper more widely adopted.
Railroads began to be made of steel instead of iron. Because steel is a much more powerful material, rails now lasted for longer periods of time and were more powerful. This sparked the introduction of railroads, first in the United Kingdom, and then in the United States.
Railroads became the most important source of transportation, both of passengers and materials. In the U.S. the railroad network was extensive and allowed the shipping of goods from coast to coast. This meant increases in productivity and capital that could be reinvested in the adoption of new technologies, forming a virtuous cycle.
The Invasion of Laos of 1971 was a military offensive developed by the South Vietnamese Army led by General Xuan Lam in command of 20,000 soldiers and with American air support that left the city of Khe Sanh in 1971, during the Vietnam War.
This mission tried to cut by land the HoChi Minh Route that contributed important supplies and troops to the communist contingents that fought in the South.
The action failed in its attempt to suppress supplies and reinforcements sent from the north to the south of Vietnam through Laos.
