George Canning, British foreign minister to the U.S., had the idea to issue a declaration forbidding future colonization in the Americas. Canning suggested that the U.S. and Britain make a joint declaration, because both nations had motives for limiting colonialism (besides their own) in the Americas. U.S. President James Monroe and former presidents James Madison and Thomas Jefferson were receptive to the idea. U.S. Secretary of State John Quincy Adams was vehemently against it, fearing that a bilateral declaration would limit the U.S.’s own expansionist designs. President Monroe eventually sided with Adams and issued a unilateral declaration.
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