What does Uncle Sam mean?

18 12 During the American-British War, Samuel Wilson, a butcher nicknamed "Uncle Sam", supplied corned beef to the US military, and we were printed on the beef barrel. US is short for both the United States and Uncle Sam, so everyone regards Uncle Sam as the representative of the United States.

Nowadays, Americans think that "Uncle Sam" is honest, reliable, hardworking and patriotic, and that this is the pride and quality of their citizens. Therefore, the nickname of the United States is "Sam State".