Why was exploration important in early america to european countries?

Exploration was very important for many reasons. Some of those reasons would include finding good and new land for plantations and colonies, making maps, picking what is needed and what is not for expansion. It was all unknown land so they needed as much information possible in order to make better use of their resources.

nativists tried to get rid of the immigrants as they thought they were going to ruin the u.s.  

the best description of postwar writers might be progressive.

following the war, writers showed a tendency to work on artistic or social matters rather than political themes. while postwar literature may not have been the greatest period of english literature, the themes provided excellent critics a high number of novels. such examples include anthony burgess, anthony powell and frank kermode, all of which can be placed under the progressive view.