From the Overview: "Though geographically only about three times the size of Washington, DC, and with a population of about 5.9 million, the city-state of Singapore exerts economic and diplomatic influence on par with much larger countries. Its stable government, strong economic performance, educated citizenry, and strategic position along key shipping lanes afford it a large role in regional and global affairs. For the United States, Singapore has been a partner in both trade and security initiatives and an advocate of a strong U.S. role in the Asia-Pacific region. At the same time, Singapore's leaders have aimed to maintain close relations with China, and to strike a balance among the region's powers."
CRS In Focus, IF10228
Congressional Research Service: https://crsreports.congress.gov/