Thursday Morning Riddle

I’m the tax that goes up the more money you earn;
As an Era, I saw the old century turn;
Education that teaches how students will learn;
Or a left-leaning voter who might Feel the Bern.

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Asher Says:

    PROGRESSIVE

  2. Bill Says:

    I am congratulating Asher because he has been solving these correctly, and likely will be solving many more to come!

    (Of course, I’m using the PROGRESSIVE tenses here.)

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