RealLifeLore explains the history between the two countries and the multi-faceted motivations behind the invasion. As you might expect, the reasons are complex and full of unknowns.
Why Russia is invading Ukraine, a visual guide
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Income in Each State, Adjusted for Cost of Living
A dollar might not buy you as much in one state as it does in the other.
Oldest, Youngest, and Middle Children, in Differently Sized U.S. Households
I looked at the percentages of people with a given number of kids in the family and the order they were born.