When Iraq invaded Iran that led the u.s to take action
Yes, lack of foreign conflict for close to 100 years until world war 1 which is a sign of its success.
Lincoln wanted to bring the south back into the union as quickly as possible, because he knew that a house divided "could not stand". He didn't want to punish the South like many other Republicans.
From 1860 to 1895, the United States experienced advances in technology, the industrial revolution and the Mexican-American war.
It can't be the Spanish American war because that didn't happen until some years later. It can't be an agrarian revolution because this is during the INDUSTRIAL Revolution and education at the time wasn't prioritized as much as it is today.
