1885-1965 1893-1978 1903-1970 20thcentury abstractexpressionism adolph american art avery biography celilo columbiarivervalley exhibitions floracushinway gottlieb governmentrelations history indiansofnorthamerica landtenure mark marthaferguson mckeown milton modern oregon politicalaspectscelilofallsindianrelocationproject relationswithindians relocation rothko thompson unitedstates whites women