It wasn't an option. The British lauched major assaults after Napoleon's first defeat in 1814, and they famously burned the capital, but their forces failed to decisively defeat the United States as they were repelled from other major cities. In Ghent, the two sides essentially negotiated a draw--no land switched hands I either direction. After they signed they signed the Treaty of Ghent, but before news reached the Americas, the United States soundly defeated a British assault on New Orleans, further indicating that the British were in no position to end the war on the battlefield. Had the war go e differently, the British did intend to take western lands from the United States in the form of a sponsored Indian confederacy.