Final answer:
Rosa's life changes drastically after St. Clare's death as she falls under the control of the tyrannical Simon Legree, signifying a change in authority.
Step-by-step explanation:
After the death of Augustine St. Clare, Rosa experiences a signal of the change in authority when she is subjected to the tyranny of Simon Legree, who inherits St. Clare's estate and slaves.
This change represents a drastic shift from St. Clare's relatively more humane treatment of his slaves to Legree's cruel regime, highlighting the precariousness of slaves' lives and the uncertainty of their fates dependent on their masters.
In "Uncle Tom's Cabin" by Harriet Beecher Stowe, after the death of Augustine St. Clare, Rosa takes charge of the household. This signals the change in authority as she becomes the new head of the household, overseeing its affairs in the absence of Augustine.
The shift in leadership reflects the dynamics of power and control within the narrative, illustrating how characters adapt to changes in circumstances and relationships.