How does Robert A. Caro use imagery in The Path to Power?

Imagery:

"Another pattern with significant implications is established in this volume. Lyndon Johnson's use of money as a lever to move the political world."

"As Georgia's land wore out under repeated cotton crops, men searched for new land on which to plant it, and when, after the War of 1812, Georgia's western territories were cleared of Indians, settlers poured into them in a great migration."