States that are flatter than Kansas

They say that Kansas is flatter than a pancake, which, according to science, is true. What six states are flatter than Kansas?
States are in order of flatness, with flattest first
Secondary Source: The Atlantic
Quiz by halpie
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Last updated: September 9, 2019
First submittedSeptember 8, 2019
Times taken63
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Answer
Florida
Illinois
North Dakota
Louisiana
Minnesota
Delaware
+1
Level 85
Apr 12, 2020
What constitutes flatter? Difference between highest and lowest elevation? Although that would almost shoo in hilly Rhode Island by default...