William IV was King of the United Kingdom of Great Britain and Ireland from 26 June 1830 until his death in 1837. The third son of George III, William succeeded his elder brother George IV, becoming the last king and penultimate monarch of Britain's House of Hanover.

William served in the Royal Navy in his youth and was nicknamed the "Sailor King". In 1789, he was created Duke of Clarence and St Andrews. In 1827, he was appointed as Britain's first Lord High Admiral since 1709. As his two older brothers died without leaving legitimate issue, he inherited the throne when he was 64 years old. His reign saw several reforms: the poor law was updated, child labour restricted, slavery abolished in nearly all of the British Empire, and the British electoral system refashioned by the Reform Act 1832. He was the last monarch to appoint a prime minister contrary to the will of Parliament.

At the time of his death William had no surviving legitimate children. He was succeeded by his niece Victoria and in Hanover by his brother Ernest Augustus.

Charles Grey, 2nd Earl Grey, (13 March 1764 – 17 July 1845), known as Viscount Howick between 1806 and 1807, was a member of the Whig Party and was a long-time leader of multiple reform movements, most famously the Reform Act 1832. His government also saw the abolition of slavery in the British Empire, in which the government purchased slaves from their owners in 1833. Grey was a strong opponent of the foreign and domestic policies of William Pitt the Younger in the 1790s. In 1807, he resigned as foreign secretary to protest the King's uncompromising rejection of Catholic Emancipation. Grey finally resigned in 1834 over disagreements in his cabinet regarding Ireland, and retired from politics.

Earl Grey tea is named after him.

The Black Hawk War was a brief conflict between the United States and Native Americans led by Black Hawk, a Sauk leader. The war erupted soon after Black Hawk and a group of Sauks, Meskwakis, and Kickapoos, known as the "British Band", crossed the Mississippi River, into the U.S. state of Illinois, from Iowa Indian Territory in April 1832. Black Hawk's motives were ambiguous, but he was apparently hoping to avoid bloodshed while resettling on tribal land that had been ceded to the United States in the disputed 1804 Treaty of St. Louis.

The war gave the young captain Abraham Lincoln his brief military service, although he never participated in a battle. Other participants who later became famous included Winfield Scott, Zachary Taylor, and Jefferson Davis. The war gave impetus to the U.S. policy of Indian removal, in which Native American tribes were pressured to sell their lands and move west of the Mississippi River and stay there.

The Slavery Abolition Act abolished slavery in the British Empire. This Act expanded the jurisdiction of the Slave Trade Act 1807 which made the purchase or ownership of slaves illegal within the British Empire, with the exception "of the Territories in the Possession of the East India Co", Ceylon (Sri Lanka), & Saint Helena. The Act was repealed in 1997 as part of a review of English statute but later anti-slavery legislation remains