People of Irish descent are the second largest self-reported ethnic group in the United States, after German Americans. Nine of the signatories of the American Declaration of Independence were of Irish origin.eople of Irish descent are found mainly in English-speaking countries; especially Great Britain, the United States, Canada and Australia. There are also significant numbers in Argentina and Mexico.
Despite its long history, the Great Wall of China as it is exists today was constructed mainly during the mighty Ming dynasty (1368-1644). Like the Mongols, the early Ming rulers had little interest in building border fortifications, and wall building was limited before the late 15th century.
The first segments were built in the fifth century BC and the last contributions of the Great wall of China where build in the sixteenth century AD. The complete answer. The Great Wall of China was built in a series of sections as a defense against invading nomads along the northern border of China beginning in the fifth century BC.