In 1801, British iyo Irish Baarlamaanada maray Act of Union in dhaqan galay on 1 January 1801 iyo Great Britain iyo Ireland mideeyey galay hal gobol, loo yaqaan "United Kingdom of Great Britain iyo Ireland". George fursad u isticmaalay in ay ka tanaasulaan horyaalka "boqorka France", taas oo Ingiriiska iyo British Sovereigns haystay tan iyo boqortooyadii Edward III. Waxaa la soo jeediyay in George ay qaataan horyaalka "Emperor of British Isles", laakiin waxa uu diiday. Iyada oo qayb ka ah siyaasadda Irish uu, Pitt qorsheeyay in meesha laga saaro naafada sharciga qaarkood in lagu dabaqi karo Catholics. George III ayaa sheegtay in Catholics xoreeyo lahaa in ay ku xadgudbaan uu ballanqaad coronation, kaas oo ku daray Protestant Sovereigns in ay sii wadaan diinta diinta.
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