In the late twentieth century, personal identity became a central issue for artists. such groups as who had previously been excluded from mainstream culture, began celebrating their differences

Women, Transgenders, ethnic minorities and Homosexuals

Explanation:Most of the Artists found it very difficult to express themselves due to the high level of discrimination against Women, Transgenders, Homosexuals and ethnic minority groups periods before the late twenties.

Most recently, These groups have started to express themselves and their interest following the revised Constitution granting them equal rights as other subgroups.

Previously, they were excluded from main stream Culture due to discrimination,but most cultures are giving them chance to express themselves and act as equal citizens and members of the society.

a system of cooperative federalism emerged, as the powers of the federal government expanded.

b europeans take corn to africa. corn becomes an important crop there.