 Complete the following phrase:  By 1877 Cassatt had come into frank conflict with the official French art establishment and had had both her submissions for that year rejected by the Salon. So when Edgar Degas invited her to join the Impressionists the same year, a group similarly disaffected by the Salon system, she accepted with alacrity. A planned 1878 exhibition did not take place, because of what Degas judged would be competition from the 