Florence. When the Kingdom of Italy moved its seat of government from Turin to Florence in 1865, the U.S. Legation followed. During the summer of 1871, the Italian capital moved from Florence to Rome, reflecting the completion of unification. George P. Marsh, as U.S. Minister Plenipotentiary, oversaw the move of the U.S. Legation from Turin to Florence in 1865 and from Florence to Rome in 1871.