Americans of German-descent top the list of U.S. ethnic groups, followed by Irish, 35.8 million; Mexican, 31.8 million; English, 27.4 million; and Italian, 17.6 million, analysis of Census and American Community Survey data shows.mid the surge of Hispanics, the largest ethnic group in the U.S. is still German-Americans, with a population of 49.8 million, a jump of 6 million between 2000 and 2010.
Great Wall History. The history of the Great Wall is said to have started from the Spring and Autumn Period (770 - 476 BC). Over the following 2,000 years, more than 20 states and dynasties played a part in its construction. The accumulative length of the wall exceeds 31,069 miles (50,000 km). Zhou Dynasty (1046 - 256 BC)
From the first wall built during the Spring and Autumn period (770-476 BC) to the last work on it during the Ming Dynasty in the 17th Century, the building of the Great Wall of China spanned over 2500 years, and involved over twenty states and dynasties, so the history, functions and structure of The Wall are many and varied.