DENVER — States are free to legalize marijuana, Colorado argued Friday in a filing to the U.S. Supreme Court in response to a lawsuit from neighboring states that have asked the nation’s highest court to shut down Colorado’s pot law.

The filing marks the first time Colorado has defended legal marijuana in writing.

The federal government did not sue to block the state’s 2012 vote to legalize pot for all adults over 21.

Colorado said that Nebraska and Oklahoma should sue the federal government for not enforcing the Controlled Substances Act, not other states. Colorado said the states’ “quarrel is not with Colorado but with the federal government’s” approach to letting states experiment with pot law.

“Nebraska and Oklahoma filed this case in an attempt to reach across their borders and selectively invalidate state laws with which they disagree,” Colorado argued.

Because federal drug law bans marijuana for any purpose, including medical, the federal government can’t throw out recreational pot laws but not medical pot laws in effect in 23 states and Washington, D.C., Colorado argued.

“Congress has endorsed a policy, at least with respect to medical marijuana, supportive of state regulatory and licensure laws,” Colorado wrote. “This suit threatens to upset those administrative and political decisions.”

The U.S. Supreme Court has not said whether it will hear the challenge, and it has no deadline for doing so.

Colorado faces three more marijuana challenges in a lower federal court.

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