Start with a Keywords search, using words that describe your topic, and see what you find.
You might try different combinations of the following, as Subject searches. You can also add in geographic terms, such as a state or city (in place of United States), date terminology, such as 20th century, and key terms, like history.
Search a collection of important scholarly journals representing a range of disciplines.
Search for articles from scholarly journals in all areas of research
Search articles, government documents, and grey literature related to international politics and public policy