Passage: Banned from the palace and shunned by his own father, the Prince of Wales was identified for the next several years with opposition to George I's policies, which included measures designed to increase religious freedom in Great Britain and expand Hanover's German territories at the expense of Sweden. His new London residence, Leicester House, became a frequent meeting place for his father's political opponents, including Sir Robert Walpole and Viscount Townshend, who had left the government in 1717.The king visited Hanover again from May to November 1719. Instead of appointing George to the guardianship, he established a regency council. In 1720, Walpole encouraged the king and his son to reconcile, for the sake of public unity, which they did half-heartedly. Walpole and Townshend returned to political office, and rejoined the ministry. George was soon disillusioned with the terms of the reconciliation; his three daughters who were in the care of the king were not returned and he was still barred from becoming regent during the king's absences. He came to believe that Walpole had tricked him into the rapprochement as part of a scheme to regain power. Over the next few years, Caroline and he lived quietly, avoiding overt political activity. They had three more children: William, Mary, and Louisa, who were brought up at Leicester House and Richmond Lodge, George's summer residence.In 1721, the economic disaster of the South Sea Bubble allowed Walpole to rise to the pinnacle of government. Walpole and his Whig Party were dominant in politics, as the king feared that the Tories would not support the succession laid down in the Act of Settlement. The power of the Whigs was so great that the Tories would not come to hold power for another half-century.

Question: Who prevented the Tories from being in power?
the Whigs