Answer:
A. Domino Theory
Explanation:
The domino theory was the fear that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect. In this case America was in fear that the spread of communism would lead to possibly India.
The relationship between the second great awakening and the reform era was that the Second Great Awakening taught people that moral sins such as slavery were a disservice to God, and therefore should be reformed.
The correct answer to this open question is the following.
If the question refers to the Westward Expansion from 1807 to 1912, that made thousands of pioneers to cross the Oregon Trail, then some possible consequences of the rapid settlement of Oregon would be the occupation of lands to be used as farms and get people new opportunities to make a decent living growing crops. The rapid settlement was notorious by 1840. Oregon lands "promised" fertile soil. That is why people from the Mississippi Valley decide to move to Oregon. Mane Eastern farmers decided to better move to Oregon instead than New Mexico or California, thinking that the land in Oregon was more fertile to farmland. People had to cross the above mentioned Oregon Trail, knowing that the trip would not be easy.
The forms of coerced labour were similar to the past in that those with power used it to coerce their subjects for valuable goods. This system was particularly excessive in King Leopold's Congo where he cut of the hands of anyone that didn't harvest rubber for him.