MLA International Bibliography is the primary database for finding scholarly articles in literature. You can search for an author, a work, a keyword, etc. The citations link to full-text in many but not ALL cases because the database contains citations for articles (often readily available electronically) but also books (not so available electronically) and dissertations (electronically available but not through this database).
Ethnic Newswatch has full-text of news from a variety of ethnic communities. Some articles are in Spanish.
JSTOR has 37 important journals relating to Latin American studies. JSTOR does not have current (last 5 years) in the case of many of these journals, but they have the complete historical full-text.