rancorous controversies in and out of Congress, and the people of the free labor States became violently excited. After long and bitter discussions in both Houses of Congress, the bill became a law in May following. The people of the North thought they perceived in this measure a determination to make slavery national; and the boast of Robert Toombs, of Georgia, that he would yet "call the roll of his slaves on Bunker Hill," seemed likely not to be an idle one.
In the light of historic events, it is clear today, that men who afterward appeared as leaders in the war against our government, were then concocting and executing schemes for the extension of the domains of the slave system. It must expand or suffocate. They contrived and put in motion expeditions for conquering neighboring provinces, in the southwest, under various pretexts, and their acts were unrebuked by our government. They formed a design to conquer parts of Mexico, and also Central America; and the theatre of their first practically successful endeavors was on the northern portion of the great isthmus between North and South America.  The first movement was an armed "emigration" into Nicaragua, with peaceful professions, led by Colonel H. L. Kinney. This was followed by an armed invasion by Californians led by William Walker, first, of provinces in Mexico, and then of the state of Nicaragua. Walker also made peaceful professions on landing, but the next day he cast off the mask and attempted to capture a town. He was soon driven out by Nicaraguan troops, and escaped in a schooner. He soon reappeared with a stronger force (September, 1855 when the country was in a state of revolution, and pushed his scheme of conquest so vigorously that he seized the capital of the state (Grenada), in October, and placed one of his followers (a Nicaraguan) in the presidential chair.
He also strengthened his power by armed "immigrants" who came from the slave labor States. The other governments on the isthmus were alarmed for their own safety, and in the winter of 1856 they formed an alliance for expelling the invaders. Troops from Costa Rica marched into Nicaragua, but were soon driven out by Walker's forces. So firm was his grasp that he caused himself to be elected President of Nicaragua, and the government at Washington hastened to acknowledge the new "nation", by cordially receiving Walker's embassador in the person of a Roman Catholic priest named Vigil. For two years this usurper ruled that state with a high hand, and offended commercial nations by his interference with trade. At length the combined powers on the isthmus crushed him. In May, 1857, he was compelled to surrender the remnant of his army, but escaped himself through the interposition of Commodore Davis of our navy. Late in the same year he reappeared in Central America, when he was seized, with his followers, by Commodore Paulding, and sent to New York as an offender against neutrality laws. The President (Buchanan) privately commended Paulding for his action, but for "prudential reasons," as he said, he publicly condemned the commander in a message to Congress, for "thus violating the sovereignty of a foreign country." Walker was allowed to go free, when he fitted out another expedition and sailed from Mobile. He was arrested only for leaving port without a clearance, and was tried and acquitted by the supreme court at New Orleans. Then he went again to Nicaragua, where he made much mischief, and was finally captured and shot at Truxillo.
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