The state - home to American firms such as Microsoft, Amazon.com and aircraft maker Boeing - exported more to mainland last year than any other President Xi Jinping, who arrives in Seattle on Tuesday, visited the United States in 2012 when he was vice-president. File photo: AP When President Xi Jinping arrives in the northwest US city of Seattle on Tuesday, on his way to the capital, Washington, later this week, he will be visiting the American state that exports more to his country than any other.