For 10 points, name this most populous unincorporated territory of the United States.
In 2011 students at the Río Piedras campus of this polity's oldest public university faced off against riot police during a strike over cost-cutting measures. In August 2015, this government defaulted on a payment to its Public Finance Corporation as it struggled with a 72 billion (*) dollar debt, and its high cost of living is partially due to the Jones Act. After this polity voted in a 2012 referendum to change its political status, several designs for 51-star flags were created, but the bill to make this territory a state died in Congress. For 10 points, name this most populous unincorporated territory of the United States.
In 2011 students at the Río Piedras campus of this polity's oldest public university faced off against riot police during a strike over cost-cutting measures.
Commonwealth of Puerto Rico