One of the main challenges that the colonists faced was the
a.
shortage of food
c.
shortage of labor supply
b.
shortage of arable land
d.
all of the above

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