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Appointment

A constitutional crisis arose when the king dismissed the Fox–North coalition government and named Pitt to replace it. Though faced with a hostile majority in Parliament, Pitt was able to solidify his position within a few months. Some historians argue that his success was inevitable given the decisive importance of monarchical power; others argue that the king gambled on Pitt and that both would have failed but for a run of good fortune.

Pitt, at the age of 24, became Great Britain's youngest prime minister ever. The contemporary satire The Rolliad ridiculed him for his youth:

Above the rest, majestically great, Behold the infant Atlas of the state, The matchless miracle of modern days, In whom Britannia to the world displays A sight to make surrounding nations stare; A kingdom trusted to a school-boy's care.

Many saw Pitt as a stop-gap appointment until some more senior statesman took on the role. However, although it was widely predicted that the new "mince-pie administration" would not outlast the Christmas season, it survived for seventeen years.

So as to reduce the power of the Opposition, Pitt offered Charles James Fox and his allies posts in the Cabinet; Pitt's refusal to include Lord North, however, thwarted his efforts. The new government was immediately on the defensive and in January 1784 was defeated on a motion of no confidence. Pitt, however, took the unprecedented step of refusing to resign, despite this defeat. He retained the support of the king, who would not entrust the reins of power to the Fox–North Coalition. He also received the support of the House of Lords, which passed supportive motions, and many messages of support from the country at large, in the form of petitions approving of his appointment which influenced some Members to switch their support to Pitt. At the same time, he was granted the Freedom of the City of London. When he returned from the ceremony to mark this, men of the City pulled Pitt's coach home themselves, as a sign of respect. When passing a Whig club, the coach came under attack from a group of men who tried to assault Pitt. When news of this spread, it was assumed Fox and his associates had tried to bring down Pitt by any means.