The Anglo-French blockade of the Río de…

The Anglo-French blockade of the Río de la Plata is formally declared on September 18, 1845.

During the 1830s and 1840s, the British and French governments are at odds with Juan Manuel de Rosas' leadership of the Argentine Confederation.

Rosas' economic policies of requiring trade to pass through the Buenos Aires custom house—which is his method of imposing his will on the Littoral provinces—combined with his attempts to incorporate Paraguay and Uruguay to the Confederation, are in conflict with French and British economic interests in the region.

During his government, Rosas has to face numerous problems with these foreign powers, which in some cases reach levels of open confrontation.

These incidents include two naval blockades, the French blockade in 1838, and the Anglo-French of 1845.