The U.S. has been a Pacific nation since before 1850 (California statehood). With the addition of
Further, with the expenditure of lives of young Americans and the expenditure of vast sums to free the Pacific from occupation (including - by the way - China, the Philippines, New Guinea and other areas), we have paid our dues as a Pacific nation. We have every right and reason to be involved in the region. We are a "stakeholder."
Here's a show from 1946 dealing with the issues of Pacific in the days after WWII: