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In 1847 the Colombian government negotiated the building of a transcontinental railroad by investors in the United States, but political and health problems kept it from becoming operational until 1855. The Bidlack-Mallarino Treaty of 1846 had granted the United States a right-of-way through the isthmus and thus the right to intervene to protect the line and free transit across the continent. Political turmoil raged while construction was under way. Panama inaugurated and discarded 20 governors (also called presidents), while New Granada (now Colombia) elected, substituted, or deposed 7 in Bogotá. The railroad helped the gold rushers destined for California, U.S., ...(100 of 11680 words)