[ProtectOurFreedom]

...the line of volcanoes in Oregon, Idaho, and Wyoming that dots part of the Midwest.

Not only do the subducted plates move, but they have changed where our states are located. Oregon, Idaho, and Wyoming are now in the Midwest. People in Chicago, St. Louis, and Minneapolis need to keep an eye out for new volcanos in their neighborhoods.

[ETL]

Not only do the subducted plates move,

Here, I believe they're talking about a section of an ancient oceanic plate which had apparently snapped off long ago but still, presumingly under its own weight, continues sinking (subducting) beneath the NA Plate.

[IYAS9YAS]

Not only do the subducted plates move, but they have changed where our states are located. Oregon, Idaho, and Wyoming are now in the Midwest. People in Chicago, St. Louis, and Minneapolis need to keep an eye out for new volcanos in their neighborhoods.

And there is this, too: "The process started at the Oregon-Idaho border about 16 million years ago and propagated northwestward, forming a line of volcanoes that are progressively younger as they stretched northwest to present-day Wyoming," Zhou added.