Where can I find records of demographics dating back to 1900?

Question

I am student-teaching Where The Red Fern Grows and would like to do a database on race %ages from Oklahoma. Such as: x% of white people 1920, x% black, x% Native American etc

Answer 1

Historical census data about 1790-1960 for US by state and race and other criteria: http://fisher.lib.virginia.edu/collections/stats/histcensus/

This might be the same data from a the Census Dept: http://www.census.gov/prod/www/abs/decennial/index.htm

Have fun teaching!

Answer 2

Also check out state of Oklahoma data to see what the state has collected over the years.