What nation or nations does this document blame for causing the war

ummm? is that supposed to be a question or a but this is a reason he won re-election

explanation:

"despite progress in the war, lincoln and most political pundits were convinced that he would lose his bid for reelection in 1864. the country was war weary and the democratic party's nominee, george mcclellan, was likely to negotiate a peace treaty with the confederacy if elected." - loc.gov

nativists tried to get rid of the immigrants as they thought they were going to ruin the u.s.  

the governor can not veto a referendum that the voters approve