the time. Black Hawk's tribe had killed his daughter. Black Hawk moved back to Iowa in 1833, after being held prisoner by the United States government. Territorial settlement The resolution of these Indian conflicts opened the way for Wisconsin's settlement. Many of the region's first settlers were drawn by the prospect of lead mining in southwest Wisconsin. This area had traditionally been mined by Native Americans. However, after a series of treaties removed the Indians, the lead mining region was opened to white miners. Thousands rushed in from across the country to dig for the "gray gold". By 1829, 4,253 miners and 52 licensed smelting works were in the region. Expert miners from Cornwall in Britain informed a large part of the wave of immigrants. Boom towns like Mineral Point, Platteville, Shullsburg, Belmont, and New Diggings sprang up around mines. The first two federal land offices in Wisconsin were opened in 1834 at Green Bay and at Mineral Point. By the 1840s, southwest Wisconsin mines were producing more than half of the nation's lead, which was no small amount, as the United States was producing annually some 31 million pounds of lead. Wisconsin was dubbed the "Badger State" because of the lead miners who first settled there in the 1820s and 1830s. Without shelter in the winter, they had to "live like badgers" in tunnels burrowed into hillsides. Although the lead mining area drew the first major wave of settlers, its population would soon be eclipsed by growth in Milwaukee. Milwaukee, along with Sheboygan, Manitowoc, and Kewaunee, can be traced back to a series of trading posts established by the French trader Jacques Vieau in 1795. Vieau's post at the mouth of the Milwaukee River was purchased in 1820 by Solomon Juneau, who had visited the area as early as 1818. Juneau moved to what is now Milwaukee and took over the trading post's operation in 1825. When the fur trade began to decline, Juneau focused on developing the land around his trading post. In the 1830s, he formed a partnership with Green Bay lawyer Morgan Martin, and the two men bought 160 acres (0.6 km2) of land between Lake Michigan and the Milwaukee River. There they founded the settlement of Juneautown. Meanwhile, an Ohio businessman named Byron Kilbourn began to invest in the land west of the Milwaukee River, forming the settlement of Kilbourntown. South of these two settlements,