What do you mean by reconcile?

Like Irishfafnir, I'm not 100% sure what you mean by reconcile. Here's a section of the FAQ which covers Anglo-American relations, perhaps that's what you're looking for? If not, try being more specific. Hope that helps!

I can't say that I know the exact moment they became close allies but international relations between the US and Britain were cool at several points throughout the 19th century, even after the War of 1812. A lot of these tensions (not that war was imminent or anything) stemmed from both economic competition and the fact that the US-Canada border was unclear until the 1840s. Various competing claims around Maine and the Great Lakes region weren't settled until the Webster-Ashburton Treaty of 1842 and the western border wasn't settled as the 49th parallel until the Oregon Treaty of 1846 (remember "54' 40" or Fight!" and all that).

Those border resolutions calmed a lot of Anglo-American tensions but once the Civil War came and the possibility of Britain recognizing the Confederacy came up, the US adopted a fairly aggressive stance in response. A large portion of Britain's eventual decision not to get involved in the Civil War was because the Union made it clear that any assistance to the Confederacy would mean war with the Union. Following the war, a pretty cooperative relationship renewed, especially with the Treaty of Washington in 1871, the details of which escape me right now.

Phillip Myers, in his book Caution and Cooperation, stresses that throughout this entire period both countries were committed to maintaining a cooperative and constructive diplomatic framework, basically saying that all these treaties were designed to keep any tensions between the nations from growing too large.