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The number of steamboats on western rivers in the U.S. grew from 187 in 1830 to 735 in 1860. Total registered tonnage of steam vessels for the U.S. grew from 63,052 in 1830 to 770,641 in 1860. [76]: 30 Until the introduction of iron ships, the U. S. made the best in the world. The design of U.S. ships required fewer crew members to operate.