Who were the industrialist for the glided age?

Mark Twain called the late 19th century the "Gilded Age." By this, he meant that the period was glittering on the surface but corrupt underneath.

To the Pacific, Mississippi River, France, Louisiana, 1804, (Merriweather) Lewis and (William) Clark.

Sidenote: Jefferson wanted to extend the US across the Continent due to an idea at the time called "Manifest Destiny"