States. It bet, in effect, on England rather than France as the hegemonic European power of the future, which proved prophetic. It recognised the massive dependence of the American economy on trade with England. In a sense it was a precocious preview of the Monroe Doctrine (1823), for it linked American security and economic development to the British fleet, which provided a protective shield of incalculable value throughout the nineteenth century. Mostly, it postponed war with England until America was economically and politically more capable of fighting one." The US proclaimed its neutrality in the wars between Britain and France (1793–1815), and profited greatly by selling food, timber and other supplies to both sides. Thomas Jefferson had bitterly opposed the Jay Treaty because he feared it would strengthen anti-republican political enemies. When Jefferson became president in 1801, he did not repudiate the treaty. He kept the Federalist minister, Rufus King in London to negotiate a successful resolution to outstanding issues regarding cash payments and boundaries. The amity broke down in 1805, as relations turned increasingly hostile as a prelude to the War of 1812. Jefferson rejected a renewal of the Jay Treaty in the Monroe–Pinkney Treaty of 1806 as negotiated by his diplomats and agreed to by London; he never sent it to the Senate. The transatlantic slave trade was largely suppressed after Great Britain passed the Abolition of the Slave Trade Act in 1807. At the urging of President Jefferson, the United States passed the Act Prohibiting Importation of Slaves in 1807, to take effect January 1, 1808. War of 1812 The United States imposed a trade embargo, namely the Embargo Act of 1807, in retaliation for Britain's blockade of France, which involved the visit and search of neutral merchantmen, and resulted in the suppression of Franco-United States trade for the duration of the Napoleonic Wars. The Royal Navy also boarded American ships and impressed sailors suspected of being British deserters. Expansion into the Midwest (i.e. Ohio to Wisconsin) was hindered by Native American tribes given munitions and support by British agents. Indeed, Britain's goal was the creation of an independent Indian state to block expansion westward by the US. After diplomacy and the boycott had failed, the issue of national honour and independence came to the fore. Brands says, "The other war hawks spoke of the struggle with Britain as a second war of independence; [Andrew] Jackson, who