The word A. AGGREGATE is both a noun and a verb.
Aggregate as a noun is defined as a whole formed by combining several elements that are typically disparate.
Aggregate as a verb is defined as the act of forming or grouping into a class or cluster.
Congregate is both a verb (gather into a crowd or mass) and an adjective (communal).
Segregate is a verb defined as the act of setting apart from the rest or from each other.
Based on the author's word choice, the statement that best explains what the author is suggesting in this sentence is - the use of the word "irritated" indicates that Wilson was not a strong supporter of the war.
He wanted America to be left out of this war, however, in the end it entered to defeat the enemy.
