the phrase "your new-caught sullen peoples, /half devil and half child" is an example of what belief that europeans used to justify imperialism?

Scientific racism

Explanation: The line is from “The White Man’s Burden.” Europeans considered themselves superior to other races, and thought it was their mission to “civilize” them. This is how they justified imperialism, and the invasion and exploitation of other nations.

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.