Although Paris remained the centre of the art world at the beginning of the 20th Century, in the United States, art was progressing at a frantic pace, often independent of developments elsewhere. The gritty realism of the Ashcan School developed in New York at a time when that city was undergoing significant social changes. Two World Wars brought vast numbers of European émigrés to the country, bringing with them trends which influenced their American peers. Abstract Expressionism, credited entirely to the United States shifted the focus away from Europe; America now dominated trends. Pop Art was a perfect reflection of consumer-driven Post-War America. Political change brought about by the Civil Rights and Feminist Movements, broadened the scope of topics an artist might address, an attitude which continues to the present day.