King County is increasingly a cosmopolitan area, with immigrants from all over the world making new homes here. Many of these immigrants end up marrying citizens and living happy lives as new Americans. However, marrying an American citizen does not automatically make a spouse an American citizen, and citizenship comes with certain rights that non-citizen spouses don't enjoy. Some of these may not become apparent until after one of the spouses dies.
American citizens have an unlimited marital deduction for assets they give to a spouse. This means that transfers of property from one spouse to the other aren't subject to gift or estate taxes. Many estate planning strategies are built around this deduction. However, the deduction is only available when both spouses are U.S. citizens.