Why does Washington state have the most regressive tax system

Washington ranks as the worst state for low-income earners to live, and it's notably worse than any other state. ... The institute says these have the most regressive tax systems, in which poor residents pay much higher shares in taxes than the wealthiest.

Explanation:

the government paid religious orders to provide basic education to native american children on reservations. in the late 19th and early 20th centuries, the bureau of indian affairs (bia) founded additional boarding schools based on the assimilation model of the off-reservation carlisle indian industrial school.

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.