Final answer:
Resentment towards Governor Berkeley's rule and economic hardships contributed to the political causes of the rebellion. The Duke of Somerset believed in gaining more power for smaller planters.
Step-by-step explanation:
The political causes of the rebellion in question can be attributed to various factors. One major factor was the resentment towards Governor Berkeley's rule, as he favored the wealthiest residents at the expense of smaller planters and landless tenants. Additionally, high taxes imposed on the commoners to support the governor's inflated salaries further fueled their dissatisfaction.
Another important factor was the decline in the price of tobacco, the colony's main cash crop, due to the implementation of Navigation Acts and the crown's trade war with the Dutch. This economic hardship worsened the situation for many colonists, leading to increased frustration and discontent.
In relation to Somerset's actions, the Duke of Somerset believed in gaining more power for the colony's smaller planters. He willingly accepted leadership in the rebellion to unseat Governor Berkeley and address the grievances of the commoners.