What do "soil" and "air "represent in the first line?

Read the quoted parts carefully and answer the questions in English. Write your answers in the corresponding space on the answer sheet.“My tongue，every atom of my blood，form’d from this soil， this air,/Born here of parents born here from parents the same， and their parents the same?/I,now thirty-seven years old in perfect health begin,/Hoping to cease not till death. 
What do "soil" and "air "represent in the first line?
【正确答案】：

AMERICA,HIS COUNTRY,HIS NATIVE LAND.

【题目解析】：America,his country,his native land.