The Libraries have a LOT of e-journal subscriptions and hundreds of databases designed to help you find them. You can use PRIMO, the main catalog, to find interesting secondary sources (like articles!). For specialized US history topics, you may want to try America: History and Life. Both work in a similar manner.
This link opens in a new window This link opens in a new windowCompare these 3 searches for economic* AND "atlantic slave trade"
America: History and Life gives the fewest results, but they are much more in line with what we want.
Googlescholar provides about 40,000 results we can't really skim through or narrow.
PRIMO provides a few hundred results, many of which aren't directly related to our topic.
Just to get started, let's try "atlantic" or "atlantic world" in America: history & life or Historical Abstracts.
Pay attention to keywords suggested by the database.
Also remember, we already know Atlantic Ocean Region work as a subject search.