The idea that independence was not the initial concern is evidenced by the fact that few areas declared independence in the years after 1810. The congresses of Venezuela and New Granada did so in 1811 and also Paraguay in same year (14 and 15 May 1811). Some historians explain the reluctance to declare independence as a "mask of Ferdinand VII": that is, that patriot leaders felt that they needed to claim loyalty to the deposed monarch to prepare the masses for the radical change that full independence eventually would entail. Nevertheless, even areas such as Río de la Plata and Chile, which more or less maintained de facto independence from the peninsular authorities, did not declare independence until quite a few years later, in 1816 and 1818, respectively. Overall, despite achieving formal or de facto independence, many regions of Spanish America were marked by nearly continuous civil wars, which lasted well into the 1820s. In Mexico, where the junta movement had been stopped in its early stages by a coalition of Peninsular merchants and government officials, efforts to establish a government independent of the Regency or the French took the form of rebellion, under the leadership of Miguel Hidalgo. Hidalgo was captured and executed in 1811, but a resistance movement continued, which declared independence from Spain in 1813. The Gutiérrez–Magee Expedition was a joint Tejanos-US volunteers expedition formed in Louisiana for Texas independence but was defeated in the Battle of Medina. In Central America, attempts at establishing juntas were also put down, but resulted in significantly less violence. The Caribbean islands, like the Philippines on the other side of the world, were relatively peaceful. Any plots to set up juntas were denounced to the authorities early enough to stop them before they gained widespread support.