I worked for several months in The Kingdon of Tonga in 2001 & 2002. during that time I met the King (who has since died) and was familiar with the family's preferences. The king and his successor were pro-American however the new king's sister was very pro-China and was in a position to sway policy to favor the Chinese military. If China were to take over Taiwan, it already has convinced the Solomon Islands to restrict access by US & UK military ships, so if Tonga were added, china would have a link across the SW Pacific and could virtually cut shipping to New Zealand, Australia, Vietnam, Thailand and India from Pacific coast ports in North and South America or through the Panama Canal to Atlantic ports.