The United States was everything that the champions of imperial preference longed for, but the British Empire was not. The United States began as a heterogeneous collection of colonial settlements that in the early nineteenth century had developed into an expansive and highly integrative empire. Unlike the British Empire, the American Republic sought to incorporate its new territories in the West and the South fully into its federal constitution. Given the cleavage in the original founding of the eighteenth-century constitution, between the free-labour North and the slave-labour South, this
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