I believe the answer is: B. chinese civil war.
Both Chinese civil war and the Vietnam war carried out a similar philosophy that become the reason of the war.
They both happened due to the clash of ideology between communism and Democracy.
Increasing the number of police in a neighbourhood because there was a rise in crime is an example of a domestic issue
Its answer A(Topograpgic map)
Answer: railroad officials
Explanation: operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals.
While there was many upsides and downsides of the Louisiana Purchase, some of the things it benefited included,
-More land for farming and obtaining natural resources
-Removed France from North America
-The U.S then Gained control of New Orleans and The Mississippi River