Under Article II of the Constitution, the President is responsible for the execution and enforcement of the laws created by Congress. ... The Executive Branch conducts diplomacy with other nations, and the President has the power to negotiate and sign treaties, which also must be ratified by two-thirds of the Senate.
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In 1852 Count Camillo di Cavour became prime minister of the Kingdom of Sardinia. Austria’s domination over their country was the main obstacle to Italy's pursuit of unification. Cavour led to the unification of Italy by persuading Napoleon to a secretly planned war against Austria.