Why was lewis and clark's expedition more valuable than pike's?

When Napoleon needed money, he sold Jefferson the Louisiana Purchase, which he had acquired when he conquered Spain. To find out what he'd just purchased, Jefferson sent Merriweather Lewis and William Clark to explore it. It covered an area from Louisiana northward to Missouri and across the biggest part of the Great Plains and Northwest. The team which went with them included such diverse people as Sacajawea, a Shoshone Indian and her baby Lewis's slave, French trappers, woodsmen, and other interpreters. Lewis concentrated on cataloging what they found, such as the various Native American tribes, animals, and plants, and mapping the region, while Clark was the woodsman who led the expedition. They went through many hardships, though miraculously only one member of the expedition died over the several years they were gone. At one point they were starving in the Rocky Mountains--there was not enough fat on the deer they shot to keep them alive. They found an Indian tribe to barter with, but the chief refused to deal with them until Sacajawea walked in--she was his sister, who had been kidnapped from the tribe at the age of 5! Needless to say, they got their food. They made it to the Pacific Ocean, where they then split into two groups, one of which took a more southerly route back.

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