Voluntary migration often occurs for economic reasons; the "great migration" of African Americans of Chicago after WWI is an example of this type of movement.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

congress has authority over financial and budgetary matters, through the enumerated power to lay and collect taxes, duties, imposts and excises, to pay the debts and provide for the common defense and general welfare of the united states. the constitution also grants congress exclusively the power to appropriate funds.

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