In 35 words or fewer, why might certain primary source materials appear in archives while others appear in libraries

How did the mexcian war of independence differ from the american revolution?

Otto von bismarck once said that a great war might someday be caused by some damed foolish thing in the balkans was he right, explain

What event involving the maine motivated the united states to go to war with spain? it exploded in cuba. it was hijacked in the philippines. it exploded in panama. it was hijacked in puerto rico.