evolve - undergo development or evolution; Modern man evolved a long time ago speciate, differentiate, specialise, specialize - evolve so as to lead to a new species or develop in a way most suited to the environment. derive - come from; The present name derives from an older form
The Sixteenth Amendment (Amendment XVI) to the United States Constitution allows the Congress to levy an income tax without apportioning it among the states or basing it on Census results.
The Congress shall have power to lay and collect taxes on incomes, from whatever source derived, without apportionment among the several States, and without regard to any census or enumeration.Because of this, the US Government can tax any income, any way it wants.