By the 1820s, the main proponent of a federation of the newly born republics was Simón Bolívar, although this idea was shared by many notable contemporaries, including José de San Martín and Bernardo de Monteagudo, under either republican or constitutional monarchical governments. In 1826, Bolívar summoned a conference to be held in Panama, which was to be known as the "Amphictyonic" Congress of Panama because of the parallelism with the Hellenic Amphictyonic League. The Congress was attended by Gran Colombia (including present-day Colombia, Venezuela, Panama and Ecuador), the Federal Republic of Central America (including present-day Costa Rica, Nicaragua, El Salvador, Honduras and Guatemala), the United Mexican States, and Peru. The ostensible intention was to form a defensive league that could prevent foreign expansionism and foster the interests of the Spanish American republics. The Congress' conclusions, however, were not ratified by the participants, except for Gran Colombia. Soon after, both Gran Colombia and the United Provinces of Central America fell apart and the whole of Hispanic America was balkanized by competing national governments.