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mound
a pile of earth or stone constructed by early Native Americans for a variety of purposes
dust bowl
an area of the Midwest and Southwest that was struck by years of drought in the 1930's
steamboat
a boat powered by a steam engine
hub
a center of activity
transcontinental railroad
a rail line that crosses an entire country
interstate highway system
a system of interconnected highways in the United States
drought
a long period with little or no rain
sod
the grass, roots, and dirt that form the ground's top layer
trading post
a kind of store in which goods are traded
fur trade
the trading of goods for animal skins
mission
a settlement set up by a religious group to teach religion and help area people
irrigation
the process of bringing water to crops
crop rotation
the planting of different crops in different years
prairie
an area where grass grows well, but trees are rare
waterway
a system of rivers, lakes, and canals, through which ships travel
canal
a waterway that has been dug across land for ships to travel through
lock
a gated part of a canal or river used to raise and lower water levels
barge
a flat-bottomed boat that carries goods through lakes and rivers
badlands
a region of dry hills and sharp cliffs
erosion
the process by which wind and water wear away rock