What was a disadvantage for richard nixon in the election of 1960

Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

How did african americans the union during the civil war? a. by serving as representatives in congress b. by enlisting in the military to fight c. by organizing massive slave revolts in the south d. by negotiating for peace with the confederacy

Which 19th century technological advancement would best allow farmers along the mississippi river in iowa to quickly transport their crops to buyers in louisiana?