When you first think of a topic for your paper, it may be necessary to find alternate words for your search or narrow the subject to be sure you are not overwhelmed with results. One database is better than most at assisting with that:
CQ Researcher - Provides full-text reports and analysis of current events and controversial issues.
The following two options are not really indexes to journal articles. They are enormous collections of journals with full text access to the articles included in each journal. They do not offer searching options that are as focused as those above so the results lists can be very large. It is highly recommended that you use them with caution and very focused search terms.