What did lincoln mean when he said: "a house divided against itself cannot endure, permanently half slave and half free. i do not expect the union to be dissolved--i do not expect the house to fall--but i do expect it will cease to be divided. it will become all one thing, or all the other."

What is the columbian exchange? o a. the changes that resulted from europeans settling in the new world b. the relationships that columbus and his men had with the natives they met o c. the ships that columbus bought with money from the king and queen of spain o d. the increase in the number of native american towns in the new world