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3. Law that granted 160 acres of free land to settlers willing to improve it for five years.
9. Process of integrating Native Americans into American culture and society.
10. Unfenced public land where cattle grazed freely.
11. Areas of land set aside for Native American tribes by the U.S. government.
14. 19th-century belief that the U.S. was destined to expand westward.
16. Ranch workers who drove cattle across the plains.
17. Agreement that sought to bring peace between the U.S. and Native American tribes in 1851.
18. Vast flat region of the U.S., extending from the Mississippi River to the Rocky Mountains.

1. 1876 conflict where General Custer and his forces were defeated by Sioux warriors.
2. Major transportation project that linked the eastern and western U.S. by rail.
4. Event that caused a mass migration to California in 1849 in search of fortune.
5. The long journey of moving herds to railway centers for shipment.
6. Nickname for settlers on the Great Plains who had to break through tough soil to farm.
7. Law that divided Native American tribal land into individual allotments.
8. Term for the unexplored or newly settled western lands of the U.S.
12. Invention that ended the open range by marking property boundaries.
13. Rapidly growing town, often created near a mining area.
15. Event where settlers raced to claim land, notably in Oklahoma in 1889.