Pop Art

1.Compare with theUS, the Pop art in Britain is less brash, and had a more nostalgic flavor(Uk 的Pop Art冇咁rash, 同懷舊d).

2.Pop art is a visual art movement that emerged in the mid 1950s in Britain and in parallel in the late 1950s in the United States.

3.US: Jasper Johns and Robert Rauschenberg --frist Pop artists in US, used popular imagery such as the American flag and beer cans in their paintings.
UK:Richard Hamilton--defined pop art in1957(i am not sure about the yr, sorry~)David Hockney, R.B. Kitaj, and Allen Jones---- leading Pop artists in UK

4.Spain: associated with the new figurative, which arose from the roots of the crisis of informalism
Japan:unique and identifiable as Japanese because of the regular subjects and styles. Take inspiration largely from anime, and sometimes traditional Japanese art.

i do not know the ans. of question5
and also, i recommend u to have a look at the below website,
it is an article about pop art in chinese.

http://tw.myblog.yahoo.com/ilovekenjiilovekenji/