Two women who were writers during the in the 1920s were
willa cather and clara bow.
edith wharton and willa cather.
edith wharton and margaret sanger.
clara bow and edith wharton.

Edith Wharton and Willa Cather.

Edith Wharton:

Edith Wharton was an American novelist, short story writer, playwright, and designer. Wharton drew upon her insider's knowledge of the upper class New York "aristocracy" to realistically portray the lives and morals of the Gilded Age. She was the first woman to win the Pulitzer Prize for Literature, in 1921.

Willa Cather

Willa Sibert Cather was an American writer who achieved recognition for her novels of frontier life on the Great Plains, including O Pioneers!, The Song of the Lark, and My Ántonia.

i believe that the answer to the question provided above is that  establishing smaller ethnic communities within larger communities  gives more chance for people to know each other more but this might lead to the  conflict between groups.

d. it was created with the idea that it could be easily revised if it was ineffective