Which story synopsis is the best example of invasion literature?
a. soviet spies, posing as american citizens, try to bring down the u. s. government from within.
b. a young immigrant couple travel to the united states to find their version of the american dream.
c. young soldiers try to fight their way out of an ambush during world war ii. d. massive drought forces a family to leave their land and take a dangerous journey to a new country.

It's very important to firstly differentiate 'immigration' from 'invasion'. The two are not the same thing. Invasion is usually characterized by the takeover of a country or territory by force, through violent methods. Immigration on the other hand, occurs when one or more person tries to enter a territory/country that is not  its native one peacefully, with no intention of taking it over, but simply to make a life on this new territory. e.g. If a professional receives a proposition to work abroad, in a country that is not its native one (France, per say), and moves with his or her family there, this process may be characterized as an immigration (but never as an invasion).

Those being said, you could immediately discard letters B and D.

In letter C, if the soldiers were fighting their way out of an ambush, you can assume that soldiers from both sides were at the same territory at the moment, therefore no invasion process was in course.

Finally, the answer is letter A. Although no explicit warlike army invasion occured, the spy would try to bring the U.S. government down by force (not in a democratic method, and that could already characterize an invasion).

The theme most used after the Second World War, and until the 1990s, is the global fear of communism. The Soviet Union, as the leader of this movement, was labeled as the most dangerous opponent, not only because of the leadership position of communist ideology, but also because of the reasonably developed military and space technology. This idea has been elaborated through various books, especially through films, where some fiction points to a science-fiction scale. Thus, situations are presented in which foreign spies are infiltrated, active on the collapse of the government. This theme was a great inspiration, when the literature of the invasion is in question, because it is about the leading forces, America is leading capitalist, and the Soviet Union is leading communist power.

The answer is A.

gothic and dark natured