Dick Thornburgh — American Politician born on July 16, 1932,

Richard Lewis "Dick" Thornburgh is an American lawyer and Republican politician who served as the 41st Governor of Pennsylvania from 1979 to 1987, and then as the U.S. Attorney General from 1988 to 1991... (wikipedia)

In historical and constitutional terms, the recent political status vote in Puerto Rico was a necessary but obviously not decisive step on the road of self-determination leading to full self-government.
The need for a permanent status resolution approved by Congress is made even more clear to me because of my experience as a former Under-Secretary-General of the United Nations.
If U.S. national sovereignty continues, it is only as a state that Puerto Rico will have permanent 10th Amendment powers over its non-federal affairs, as well as voting power in Congress.
That is why, with optimism instead of fear, all those who want to see Puerto Rico's status resolved should seek the truth about each option, including the upside and the downside of each.
However, the sovereignty of the states is constitutionally defined and recognized, while the powers of the local government in Puerto Rico are defined by, and subject to alteration under, federal statutory law.