I'm afraid I won't be much help to you, but I think the best thing you can do is go to a library and ask the librarian for help. If you are looking for information on how Canadian minorities were treated by the army, there will be journal articles at your local university.
This link might help you out: http://www.qesnrecit.qc.ca/mpages/activity/actwwi.html
The treatment of minority soldiers varied a lot, many were not allowed to enter the combat services, like infantry and artillery, but were put into behind-the-lines work (which was still very dangerous and important) like construction, forestry or transport units. Other non-white soldiers were encouraged to go into front-line work.
I know there is a really good article out there on the way minorities were recruited for the Canadian Army during WW1, but I can't remember the title or the author . . . I'll see if I can find it, but go to the librarian at your school or to a librarian at a local university.
If you're looking for info on African American soldiers during WW1, a quick google search turned up this:
http://europeanhistory.about.com/gi/dynamic/offsite.htm?site=http%3A%2F%2Fwww.archives.gov%2Fdigital_classroom%2Flessons%2Fwwi_369th_infantry%2Fwwi_369th_infantry.html
I know it's for the US and not Canada, but I wasn't sure exactly what you were looking for.
Good luck, and post here if you have any more questions!
