nations. The British intervened in 1827 on the side of the Greeks, who had been waging the Greek War of Independence against the Ottoman Empire since 1821. Whig reforms of the 1830s The Whig Party recovered its strength and unity by supporting moral reforms, especially the reform of the electoral system, the abolition of slavery and emancipation of the Catholics. Catholic emancipation was secured in the Roman Catholic Relief Act 1829, which removed the most substantial restrictions on Roman Catholics in Britain. The Whigs became champions of Parliamentary reform. They made Lord Grey prime minister 1830–1834, and the Reform Act 1832 became their signature measure. It broadened the franchise slightly and ended the system of rotten and pocket boroughs (where elections were controlled by powerful families), and gave seats to new industrial centres. The aristocracy continued to dominate the government, the Army and Royal Navy, and high society. After parliamentary investigations demonstrated the horrors of child labour, limited reforms were passed in 1833. Chartism emerged after the 1832 Reform Bill failed to give the vote to the working class. Activists denounced the 'betrayal' of the working class and the 'sacrificing' of their interests by the 'misconduct' of the government. In 1838, Chartists issued the People's Charter demanding manhood suffrage, equal sized election districts, voting by ballots, payment of MPs (so poor men could serve), annual Parliaments, and abolition of property requirements. Elites saw the movement as pathological, so the Chartists were unable to force serious constitutional debate. Historians see Chartism as both a continuation of the 18th-century fight against corruption and as a new stage in demands for democracy in an industrial society. In 1832, Parliament abolished slavery in the Empire with the Slavery Abolition Act 1833. The government purchased the slaves for £20,000,000 (the money went to rich plantation owners who mostly lived in England), and freed the slaves, especially those in the Caribbean sugar islands. Leadership Prime Ministers of the period included: William Pitt the Younger, Lord Grenville, Duke of Portland, Spencer Perceval, Lord Liverpool, George Canning, Lord Goderich, Duke of Wellington, Lord Grey, Lord Melbourne, and Robert Peel. Victorian era Victoria ascended the throne in 1837 at age 18. Her long reign until 1901 saw Britain reach the zenith of its economic and political power. Exciting new technologies such as steam ships, railways, photography, and telegraphs appeared, making the world much faster-paced. Britain again remained mostly inactive