George and Lennie's desire of to reach the American Dream.
What is to buy their own piece of land and live off it.
One example from the text that supports the theme of mercy killing?
When Carlson kills Candy's dog
An example from the text that demonstrates the theme regarding loneliness and isolation?
Curley's Wife always looking for Curley or Candy living by himself after his dog died
One example from the text that shows the contrast between what is reality and dreams.
George and Lennie want buy a house but they only have 10 dollars between the both of them.
One example from the text that demonstrates how people will abuse the power they have over others.
Curley and his treatment to others, George making Lennie do things that might kill him, or Curley and his wife (their relationship)