Don't forget that newspapers, articles, and books can be primary sources too (see tutorial for explanation). Use those tabs as well.
The best resources will depend on your topic. Scan the list for your region to see if we have something specialized that matches your country and time period, but also check the All Countries section. These resources should be helpful for any topic (everyone should try these):
The following resources cover multiple countries & regions. Use these AND the resources on the Country-specific pages.