Maria I of Portugal forced Portugal to cede Olivença and other border towns to Spain. (This cession is not recognized by the present Portuguese government, and the country officially considers those territories still to be Portuguese possessions.) On September 29, 1801 John VI signed the Treaty of Madrid (1801), ceding half of Guyana to France, which became French Guiana. The refusal of the Portuguese government to join the French-sponsored Continental Blockade against Britain culminated in the late 1807 Franco-Spanish invasion of Portugal led by General Junot. The ultimate Napoleonic plan for Portugal was to split it into three sections. The northern parts of Portugal,
United States border security concerns United States border security concerns The concept of border security in the United States of America shares a complex relationship with the persistent threat of terrorism. Border security includes the protection of land borders, ports, and airports. The relationship is unique in the sense that the federal government must constantly reevaluate and tweak its border security policy to address the perceived threats posed to the United States through the form of human terrorism or the smuggling and detonation of a weapon of mass destruction. Directly after the events of September 11, 2001, the Federal Government typically placed a higher priority