which they called the Restored Government. Most voted to separate from Virginia, and the new state was admitted to the Union in 1863. In 1864 a state constitutional convention drafted a constitution, which was ratified by the legislature without putting it to popular vote. West Virginia abolished slavery by a gradual process and temporarily disenfranchised those who had held Confederate office or fought for the Confederacy. West Virginia's history has been profoundly affected by its mountainous terrain, numerous and vast river valleys, and rich natural resources. These were all factors driving its economy and the lifestyles of its residents, who tended to live in many small, relatively isolated communities in the mountain valleys. Prehistory A 2010 analysis of a local stalagmite revealed that Native Americans were burning forests to clear land as early as 100BCE. Some regional late-prehistoric Eastern Woodland tribes were more involved in hunting and fishing, practicing the Eastern Agricultural Complex gardening method which used fire to clear out underbrush from certain areas. Another group progressed to the more time-consuming, advanced companion crop fields method of gardening. Also continuing from the ancient indigenous people of the state, they cultivated tobacco through to early historic times. It was used in numerous social and religious rituals. "Maize (corn) did not make a substantial contribution to the diet until after 1150 BP", to quote Mills (OSU 2003). Eventually, tribal villages began depending on corn to feed their turkey flocks, as Kanawha Fort Ancients practiced bird husbandry. The local Indians made cornbread and a flat rye bread called "bannock" as they emerged from the protohistoric era. A horizon extending from a little before the early 18th century is sometimes called the acculturating Fireside Cabin culture. Trading posts were established by European traders along the Potomac and James rivers. Tribes that inhabited West Virginia as of 1600 were the Siouan Monongahela Culture to the north, the Fort Ancient culture along the Ohio River from the Monongahela to Kentucky and extending an unknown distance inland, and the Eastern Siouan Tutelo and Moneton tribes in the southeast. There was also the Iroquoian Susquehannock in the region approximately east of the Monongahela River and north of the Monongahela National Forest, a possible tribe called the Senandoa, or Shenandoah, in the Shenandoah Valley and the easternmost tip of the state may have been home to the Manahoac people. The Monongahela may have been the same as a