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 Sixteenth Amendment, approved by Congress in 1909 and ratified in 1913, made it possible for Congress to enact an income tax without having to worry about whether, under the rules applicable to direct taxes, the tax had to be apportioned among the states on the basis of population.