What phrase is used to describe the protection the U. S. guaranteed to its allies in the event that unfriendly forces threatened one of those nations? United Nations
Marshall Plan
nuclear umbrella
military superpower

western business men

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

a.   it resulted in widespread unemployment.