Historical clue formulations

• Part of the Corn Belt — 2026-09-24
• State that's the setting for "American Gothic" — 2026-09-06
• Part of the Corn Belt — 2026-08-19
• Where the Red Delicious apple originated — 2026-04-24
• Caitlin Clark's alma mater — 2026-03-08
• Where Caitlin Clark played Division I basketball — 2026-01-14
• The Hawkeye State — 2025-12-16
• Future birthplace of Captain Kirk — 2025-12-07
• Where Caitlin Clark played college hoops — 2025-11-08
• Midwest tribe — 2025-04-29
• Where Captain Kirk was born and raised — 2024-06-19
• Where more pigs live than people — 2023-12-28
• 57-Down's state — 2023-12-25
• Des Moines's home — 2023-11-27
• Early voting site — 2023-09-14
• Corn Belt state — 2023-09-12
• Midwest tribe — 2023-07-28
• Locale of the house depicted in "American Gothic" — 2023-07-27
• Where Des Moines is — 2023-07-24
• It has a higher population of pigs than people — 2023-03-10
• Big Ten school — 2023-02-02
• "I thought of a joke about ___, but it's too corny" (groaner) — 2023-01-07
• "The Music Man" locale — 2022-05-26
• Johnny Carson's home state — 2021-11-10
• Hawkeye State — 2021-11-01
• State generating the highest percentage of its electricity by wind — 2021-10-05
• Top pork producer in the U.S. — 2021-06-17
• Its state fair is much visited by politicians — 2021-05-03
• ___ Writers' Workshop — 2021-03-07
• Its state seal shows a steamboat on the Mississippi — 2021-02-24
• Geographical name that comes from the Sioux for "sleepy ones" — 2021-02-21
• Only state with a two-vowel postal code — 2021-02-03
• Early stop for presidential candidates — 2020-04-07
• John Wayne Birthplace Museum locale — 2020-02-06
• Des Moines's state — 2019-09-09
• Locale of Drake University — 2019-08-31
• Midwest tribe — 2019-08-09
• Hawkeye's home — 2019-05-07
• Big Ten school — 2019-04-27
• Where the first presidential caucuses are held — 2019-02-11
• Waterloo's home — 2018-12-30
• Sioux City's state — 2018-12-17
• Locale for two of the Quad Cities — 2017-10-01
• Its motto is "Our liberties we prize and our rights we will maintain" — 2017-08-17
• Where Herbert Hoover was born — 2017-02-23
• Des Moines's home — 2017-02-14
• Site of the first-in-the-nation caucuses — 2017-02-07
• State that produces the most corn — 2017-01-09
• Davenport's home — 2016-09-13
• Where the presidential primary season kicks off — 2016-06-20