id	keyword
ftr-390	tax
ftr-390	states
ftr-390	u.s
ftr-390	european
ftr-390	note
ftr-390	supra
ftr-390	taxation
ftr-390	member
ftr-390	state tax
ftr-390	income
ftr-390	court
ftr-390	united
ftr-390	commerce
ftr-390	taxes
ftr-390	supra note
ftr-390	union
ftr-390	clause
ftr-390	treaty
ftr-390	review
ftr-390	united states
ftr-390	member states
ftr-390	base
ftr-390	federal