Because it shows that even the small parts of a situation are important and make up the big picture. Just like how everything is made up of tiny little cells. Without them, we wouldn't be here. So "Even the pigs joined in a critical moment" means that even the pigs are important in a critical moment.
The following lines from the text, "How the Spaniards Came to Shung-opovi, How They Built a Mission, and How the Hopi Destroyed the Mission" best shows the narrator's point of view that the Spaniards were trying to change the religion of the Hope people are:
"<span>The missionary did not like the ceremonies. He did not like the Kachinas and he destroyed the altars and the customs. He called it idol worship and burned up all the ceremonial things in the plaza."</span><span>
</span><span>"When this mission was finally built, all the people in the village had to come there to worship, and those that did not come were punished severely. In that way their own religion was altogether wiped out, because they were not allowed to worship in their own way."</span><span>
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The statements, along with the literary device used in each, are below:
“The Army Alpha is cleverly designed"
-- This is an example of understatement. By describing the Army Alpha as cleverly designed, the speaker is downplaying the scope of the test. We are told the told the test will show the Army everything about you. Therefore, it is an understatement to say it is "cleverly designed."
“I guess that the letter was the last straw”
-- This is an example of an idiom. An idiom is a figure of speech whose meaning seems unrelated to the words used. The phrase "the last straw" has nothing to do with straws: it is a figure of speech used to explain when someone has run out of patience, etc. Therefore this is an example of an idiom.
“I took the opportunity to vomit out a Niagara of vitriol”
-- This is an example of hyperbole. Hyperbole is extreme exaggeration. Since it is impossible to vomit a literal waterfall of anything, this statement is hyperbole.
“Army Intelligence called me up in about a week, wanting to chat”
-- This is an example of irony. Army Intelligence is not calling for a chat. The speaker is being sarcastic, or ironic. Army Intelligence is going to interrogate the speaker in the presence of his lawyer. A "chat" this is not.
The word "precursor" means "preceding requirement". This means that before a student is able to take courses in Calculus, it is required that the passed all the requirements for his Algebra. Calculus is a course which involves the study on derivatives and integrals.
The author of the poem says the eyes are still such as olives
Hope this helps