Why American countries dubbed uncle sam?

Why Americans dubbed as the country's "Uncle Sam" (Uncle Sam)?. Here's the story, once a man named Samuel Wilson. He was born in Arlington, September 13, 1766. At the age of 14, he became a volunteer fighter for his country. As an adult, he opened a meat packing business in New York. He supplies the cans of meat for bertong U.S. troops in the War of 1812.
In 1812 the number of items purchased for the army at Troy, NY, by Elbert Anderson, a government contractor. Goods inspected by two brothers, Ebenezer and Samuel Wilson. Samuel Wilson is often called "Uncle Sam" by his friend. Each package is marked initials E.A.-U.S. At the time of questioning the meaning of these initials, workers who jokingly replied that EA was Elbert Anderson and Uncle Sam U.S. is that should the United States. So the title became popular among the workers, soldiers, and the people and Government of the United States now known as "Uncle Sam"
The story above is finally written in a newspaper. In the 1860s and 1870s, the political cartoonist Thomas Nast began to popularize the image of Uncle Sam. Nast developed the image by giving Uncle Sam a white beard and clothes that motivated the stars and lines. Nast also was the one who created the image of Santa Claus and the elephant as a symbol of the Republican Party. In September 1961 the U.S. Congress recognizes Samuel Wilson as the forerunner of America's national symbol.
Uncle Sam Wilson considered a role model of an entrepreneur who likes to work hard and love for his homeland. Wilson died at the age of 88 years in 1854 and was buried in Oakwood Cemetery in Troy, New York. The city was the title of 'The House of Uncle Sam.' Finally, Uncle Sam's name was officially adopted for the U.S. state nicknames. The Americans are now proud of the nickname and the image of Uncle Sam owned.