Did you intend to return to Missouri when you moved to Kansas?
If so, Missouri will be your full-year resident return. You would list Missouri as your resident state on 12/31/20.
State residency information
If you did not make any money in Kansas, you would not have a filing requirement there unless you met the filing threshold requirement. If you did, you would file your tax return there as a nonresident instead of a part-year resident.
Please see the attached link to determine if have a filing requirement in Kansas.
Kansas filing requirements
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