For scholarly articles:
For contemporary, pre-war ( 1905-1914 ) opinion & analysis:
In one or more of the recommended article databases
Do a "keyword" search for:
Tip: Do not truncate (use the *) with origin. This will retrieve "original" material dealing with the actual conduct of the war rather than its causes. Therefore it may produce many irrelevant records.
For other collections of primary source held by Notre Dame:
See the "American Memory" project in the Library of Congress Collections.