The problems that beset Presidents Washington and Adams arose more from the wars spawned by the French Revolution. War erupted in 1792 when France attempted to export its revolutionary ideas and when several European monarchical nations allied against the French, hoping to eradicate the threat posed by the republican revolutionaries. The great danger for the United States began in the spring of 1793 when Great Britain, the principal source of American trade, joined the coalition against France. Although the Washington administration proclaimed American neutrality, a crisis developed when London sought to prevent U.S. trade with France. Numerous depredations occurred on the high seas, as ships of the Royal Navy seized American ships and cargoes and sought to impress American sailors who had allegedly deserted the British navy. Cries for war with Britain were widespread by 1794. Believing that war would be disastrous, President Washington sent John Jay to London to seek a diplomatic solution. The result was Jay's Treaty, signed in 1794. The treaty improved U.S.-British relations. France, interpreting the treaty as a newly formed alliance between the United States and an old enemy, retaliated by ordering the seizure of American ships carrying British goods. This plunged Adams into a foreign crisis that lasted for the duration of his administration. At first, Adams tried diplomacy by sending three commissioners to Paris to negotiate a settlement. However, Prime Minister Charles Maurice de Talleyrand of France insulted the American diplomats by first refusing to officially receive them. He then demanded a $250,000 personal bribe and a $10 million loan for his financially strapped country before he would begin peace negotiations. This episode, known as the XYZ affair, sparked a white-hot reaction within the United States.