The gold rush brought many changes to California like: commercial boom, population increase, immigration into the union, new machinery, and transportation and agriculture.
In a number line, the numbers on the right hand side of zero are all positive numbers (1, 2, 3, 4, ...). On the left hand side of zero are all negative numbers (-1, -2, -3, -4, ...). The numbers in the coordinates of the number line are all real numbers. Thus, the answer is letter A.
The reason why Lincoln did this is because he wanted the Union to reform and heal as quickly as possible. He accurately predicted that animosity on both sides would lead to harsh divisions over the next several decades.
