Answer:
Johnson Was Impeached, But Not Convicted
https://blox.land/ref/f1f289a3-d773-64d6-caa4-a45c89af54a7
The decline of agricultural economies
The opportunity to travel widely while following the missionaries :)
The concept of nullification is a "legal theory that a state has the right to nullify, or invalidate, any federal law which that state has deemed unconstitutional with respect to the United States Constitution (as opposed to the state's own constitution)."