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Western Texas was just such a project: a grandiose scheme, germinated in secret, and unlikely to bear fruit for years. As laid out in private correspondence with Adolf Douai and other co-conspirators in Texas, the plan called for the "immigration of one or two thousand staunch and steadfast northern men, supporters of Freedom." These infiltrators should come quietly and in small groups at first, forming a "nucleus" in alliance with free- state Germans. Thereafter, migrants from the North and Europe would "pour in," aided by new railroad lines.
Olmsted kept refining and expanding on this plan, long after his return from Texas. It became, in effect, a dry run for his career as a landscape architect, including blueprints for a string of planned communities across the frontier of the Cotton Kingdom.
"I have a private grand political hobby which I must display to you," he disclosed to a Northern ally, in a letter filled with geometric shapes, lines, and arrows. The sketch was nothing less than a sweeping design for winning what Olmsted called the "war between the power of Slavery and of Freedom on this continent.
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Tony Horwitz (Spying on the South: Travels with Frederick Law Olmsted in a Fractured Land)