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9000 BCE
Paleo-Indians arrive in the southwest, including Arizona
Known as the Clovis culture, they were hunter-gatherers -
600 BCE
Ancestral Puebloans begin to settle on the Four Corners area
Occurred 600 BC - 550 AD -
1150
The Hopi village Oraibi is established.
It is the oldest continuously inhabited city in the U.S. -
Jesuit priest Eusebio Kino establishes missions among the Tohono O'odham people along the Santa Cruz River
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Arizona becomes part of the United States
With the end of the Mexican–American War, the area which includes today's Arizona becomes part of the United States, as part of the New Mexico Territory -
Arizona's first "gold rush"
Gold is discovered near the confluence of the Gila and Colorado Rivers, creating Arizona's first "gold rush" -
Colossal Cave is discovered southeast of Tucson
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Southern Pacific Railroad begins operating in Tucson
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Phoenix became Arizona’s capital
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Arizona became the forty-eighth state
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Arizona adopts its state flag
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The Grand Canyon National Park is established
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Scientist Clyde W. Tombaugh discovered Pluto
He was working at the Lowell Observatory in Flagstaff -
The Hoover Dam was finished
It is on the Colorado River between Arizona and Nevada -
Tucson International Airport begins operating
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Reid Park Zoo founded
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Arizona Science Center opens to the public in Phoenix
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Biosphere 2 built in Tucson
