If one visited UK and France, what is the possibility for Canada?
If you have a schengen and uk visa and you have visited and come back with in time then you chances of Canadian tourist visa is very very high. Apply properly with good credentials, you will get it. Once you have travelled to Canada, apply for Usa visa. It will be a cake walk, once you have these four visas you are done for life. No more issues of visa in your life. For rest of your life visas will be a mere paper work formality for you.