In the early months of 1808 the continental system was extended by the establishment of French administration at Rome, and the annexation of the eastern ports of the Papal States to the kingdom of Italy. On February 18 of the same year Austria under French pressure adopted the system. Sweden and Turkey were now the only continental countries left outside it, but the retention of Sicily by the Bourbon king rendered it easy for British commerce to enter Italy through that island. The irritation of neutrals increased as the area of commercial exclusion widened, but the United States were now the only neutral power of any consequence. After April 17 Napoleon took the high-handed step of confiscating all American shipping in his ports. In spite of this aggression, the president and congress of the United States continued to favour France against Great Britain. The story of the commercial warfare between Great Britain and the United States will be related more fully hereafter. For the present, it is sufficient to mention that an act, placing an embargo on foreign vessels in American ports, was passed by congress on December 22, 1807, and another on March 1, 1809, forbidding commercial intercourse with Great Britain and France and the colonies occupied by them. Meanwhile Great Britain continued to enforce her maritime rights, including that of searching American merchantmen for British-born sailors, and impressing them at the will of British naval officers. These grievances ultimately led to a war between Great Britain and America in 1812. The continental system, however, did not long remain so complete as in the beginning of 1808. Junot's expedition to Portugal had led to a French occupation of that country before the end of 1807. The conquest of Portugal was followed, as we shall see later, by a partial conquest of Spain. This threw the Spaniards back upon the British alliance and afforded an opportunity for the liberation of Portugal, so that from May, 1808, Great Britain once more had a large seaboard open to her commerce. The early success of the Spanish resistance to France, and other events in the peninsula hereafter to be recorded, encouraged Austria to arm again; and on the news of the capitulation of the French army at Baylen in July, she pushed forward her preparations with redoubled energy. A national movement arose simultaneously in North Germany, but the Prussian government dared not head it so long as Russia remained faithful to the French alliance. [Pageheading: _NAPOLEON AT ERFURT._]