Present-day Arizona was home to the (1)___ people. Their way of life depended on the (2)___ they dug to carry water to their fields. The (3)___ lived in the area known as the Four Corners in great stone dwellings called (4)___, or villages, as well as in cliff dwellings in the walls of steep cliffs. Several different groups of people, known as (5)___ built thousands of mounds of earth in central North America. One of these groups, the (6)___, built the Great Serpent Mound. The largest settlement was (7)___. The last group of people to cross the Beringia land bridge into North America was called the (8)___. Their main occupations were (9)___. The mild climate and dependable food sources of the (10)___ created a favorable environment for many different North American groups including the Tlingit, Haida, and Chinook, who adapted their way of life to the (11)___; the people of the (12)___, an area between the Cascade Mountains and the Rocky Mountains; and those who settled in the (13)___ between the Sierra Nevada and the Rocky Mountains. The peoples of the Great Plains were (14)___, traveling from place to place in search of food. Native Americans who lived in eastern North America formed complex political systems to govern their nations. After years of warring, the five Iroquois groups joined an organization called the (15)___. Among those who settled in the Southeast were the Creek, Chickasaw, and (16)___, who farmed the mountains of Georgia and Alabama.