The '100th meridian west' is an invisible line of longitude that roughly bisects the United States' in half, separating the humid eastern states from the arid western states. Since the 1980s, this climate boundary has been shifting further from the geographical line of longitude, as dry conditions creep into states that have historically been on the more fertile eastern side. ....
https://www.sciencealert.com/an-invisible-boundary-that-divides-the-united-states-has-started-to-shift-out-of-place-100th-meridian-aridity-climate-change
https://www.sciencealert.com/an-invisible-boundary-that-divides-the-united-states-has-started-to-shift-out-of-place-100th-meridian-aridity-climate-change
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