If you are married, then you and your spouse can file separate tax returns. The married filing separately (MFS) filing status is generally perceived as the least beneficial of all the filing statuses.
In 1783 Congress decided to create a new capital apart from any state, and in 1787 the framers of the Constitution provided for a capital district. The U.S. capital was originally Philadelphia. Washington D.C. became the new capital on July 16, 1790.
Washington State became part of the USA without dispute in 1846 (before that, Britain and the USA with some Spanish arguments disputed the area), 56 years after the founding of Washington DC and became a state in 1889, 99 years after the founding of Washington DC.