The Society of American Indians is established by Charles Eastman and others to serve as an advocacy group for Native Americans.

Franz Boas publishes The Mind of Primitive Man.


Arizona and New Mexico enter the Union.

Zane Grey publishes Riders of the Purple Sage.


Cecil B. De Mille and others form a production company that would later become Paramount Pictures.

William S. Hart appears in his first western film, The Bargain.

The construction of the Los Angeles Aqueduct is completed under the supervision of engineer William Mulholland.

Willa Cather publishes O Pioneers!


National Guardsmen and striking miners clash in Ludlow, Colorado, and eighteen are killed.

The Panama Canal is completed.

Edward Curtis releases his silent film In the Land of the Head Hunters.


Sara Bard Field completes a cross-country automobile trip collecting signatures for a women’s suffrage petition that she delivers to President Wilson.


Seattle businessman William Boeing founds the Boeing Airplane Company.

Congress creates the National Park Service.


The United States enters World War I.

Jeannette Rankin of Montana becomes the first woman elected to serve in the United States Congress.


The Native American Church is incorporated in Oklahoma with Frank Eagle as its first president.


Labor strikes in Seattle effectively close the city.


The Nineteenth Amendment – granting women the right to vote – is ratified.

The Mineral Leasing Act is passed, encouraging the development of mining on public lands in the West.


Congress passes the Federal Highway Act, authorizing equal matching funds to states for highway construction.

In May race riots break out in Tulsa, Oklahoma.


An agreement is reached on the division of water to states through which the Colorado River flows.


A sign “Hollywoodland” is built in the Hollywood hills to advertise the new housing market in the area.

Construction of the controversial Hetch Hetchy Dam in Yosemite National Park is completed.

A scandal over oil reserves at Teapot Dome in Wyoming reveals widespread corruption in the administration of recently-deceased President Harding.


Congress passes the Indian Citizenship Act, extending citizenship to all Native Americans born in the United States or its territories.

As part of the National Origins Act, Congress establishes the U.S. Border Patrol to stop the flow of illegal immigrants crossing the border into the United States. This legislation continues the ban on Chinese immigration.

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