Invasion literature written in the united states today often focuses on which common source of anxiety

The correct answer is ''Terrorism''.

Explanation:

Invasion literature is the name given, in the field of literature, to a spefici type of literary genre that became popular during the years just before the First World War. This type of genre focuses primarily in the production of anxiety regarding hypothetical invasions by foreign powers at national level. However, nowadays the writers among this genre nowadays focuses in the more common aspects of today, like mostly terrorism, an example of it is the novel Black Sunday written by Thomas Harris.

explanation:

b the manazanar relocation center was located in california. it was used to keep japanise from spying on america.

the reasons for the harsh treatment, is because japan used tourist to take pictures and snapshots of pearl harbor.

many americans were afraid that the japanise would betray them for their mother country. through and means necessary. this means that, the leadership in japan is a lot different than it is here. culture and family ties has much to do with their outlook and worldview.