The plans for converting California into a slave state were frustrated by the discovery of gold. Fifty thousand emigrants poured in. The men worked with their own hands, and would not permit slaves to be brought in by their owners. Five bills, known as the Compromise of 1850, provided that New Mexico should be organised as a territory out of Texas; admitted California as a free state; established Utah as a territory; provided a more rigid fugitive slave law; and abolished slavery in the District of Columbia. Cuba was regarded as a promising field for the extension of the slave territory when the Democratic Party returned to power in 1853 with the administration of Franklin Pierce. The ministers to Spain, France and Great Britain met in Belgium, at the President's direction, and issued the Ostend Manifesto, which declared that the United States would be justified in annexing Cuba, if Spain refused to sell the island. This Manifesto followed the popular agitation over the Virginius affair. The Spaniards had seized a ship of that name, which was smuggling arms to the Cubans, and put to death some Americans. War was averted, and Cuba remained in the control of the Spaniards. The Supreme Court in 1857, in the Dred Scott decision, held that a slave was not a citizen and had no standing in the law, that Congress had no right to prohibit slavery in the territories, and that the constitution guaranteed slave property. The Presidential campaign in 1858, which was signalised by the debates between Douglass and Lincoln, resulted in raising the Republican power in the House of Representatives, to equal that of the Democrats. A fanatic Abolitionist, John Brown, with a few followers, seized the Federal arsenal at Harper's Ferry in 1859, defended it heroically against overpowering numbers, but was finally taken, tried and condemned for treason. This incident served as an argument in the South for the necessity of secession to protect the institution of slavery. In the Presidential election of 1860, the Republican convention nominated Lincoln. Douglass and John C. Breckenridge split the Democratic vote, and Lincoln was elected President. This was the immediate cause of the Civil War. The first state to secede was South Carolina. A state convention, called by the Legislature, met on December 20, 1860, and declared that the union of that state and the other states was dissolved. Mississippi, Florida, Alabama, Georgia and Louisiana, followed in the first month of 1861, and Texas seceded February 1st. They formed a Confederacy with a constitution and government at a convention at Montgomery, Alabama, February, 1861. Jefferson Davis was chosen President, and Alexander H. Stephens, Vice-President.