A political cartoon regarding this event depicts a boat on wheels riding across a bridge, with one man saying "If we let go, we are ruined, and if we 
A political cartoon regarding this event depicts a boat on wheels riding across a bridge, with one man saying "If we let go, we are ruined, and if we hold on - Oh! crackee!" One opponent of this action, which was advocated by the Pakenham letter, was Silas Wright. John Quincy Adams once alleged in a speech that many Americans "would prefer the total dissolution of" the United States to this action, which gained strong support from Francis Blair's Washington Globe.  Isaac Van Zandt negotiated preliminaries to this action with one of its supporters, Abel (*) Upshur, and this action was opposed by presidential hopefuls Martin Van Buren and Henry Clay. For 10 points, identify this Polk campaign promise which ended the Lone Star Republic.
A political cartoon regarding this event depicts a boat on wheels riding across a bridge, with one man saying "If we let go, we are ruined, and if we hold on - Oh! crackee!"
annexation of Texas [accept logical equivalents like "making Texas a part of the United States" or similar]