 Complete the following phrase:  The 1820 Battle of Cepeda, fought between the Centralists and the Federalists, resulted in the end of the Supreme Director rule. In 1826 Buenos Aires enacted another centralist constitution, with Bernardino Rivadavia being appointed as the first president of the country. However, the interior provinces soon rose against him, forced his resignation and discarded the constitution. Centralists and Federalists resumed the civil war; the latter prevailed and formed the Argentine Confederation in 1831, led by Juan Manuel de Rosas. During his regime he faced a French blockade 18381840, the War of the Confederation 18361839, and a combined 