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Across 1. system for ranking members of a group based on their importance 5. owned an managed by the government for public use 7. to provide enough food or water; to make something continue 9. religious teachings or practices 10. population survey 13. group of people or things with similar qualities 15. ruler in 1493 who lead the empire in peace died in 1525 18. flat strips of level land 21. easily noticed

Down 2. the management of a government or business 3. labor tax 4. a government that takes responsibility for the well-being of its citizens 6. high plain centered bolivia 8. management of communication and relationships between people and nations 11. something that works well 12. group of related families that lived in the same location 14. ruler in 1438 who expanded the empire greatly 16. examine carefully to find out something or to check conditions 17. vast grassy plains of argentina and uruguay 19. to raise animals or plants to be useful to humans 20. record-keeping device made of knotted strings