When did the first americans arrived in north america

No "Americans" arrived in North America. However, in 10 A.D. Vikings explored the fringes of North America. Also, Native Americans crossed over from Siberia into Alaska over a land bridge about 12,000 years ago. In 1501, Amerigo Vespucci officially discovered America but thought it was Asia so he did not dock. Then in 1592, Christopher Columbus found and docked in the Caribbean and was the first man to land on America. 

the following best describes postwar era writers in their works:

progressive

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.