Two key things to keep in mind while looking for primary sources in databases.
Haitian Massacre (1937) is represented in Dominican historical memory
Look at secondary sources like "The border of lights reader" to help identify sources. You can also search "Dominican-Haitian Conflict, 1937" in the main library catalog and in WorldCat to find first-hand accounts and remembrances of the events. You can also use the Dominican national library to identify materials to order via ILL.
FBI surveillance of MLK and how it effected his strategy for the civil rights movement and his career
The FBI declassified documents are an interesting start, as are the newspaper databases. You can also use secondary sources to identify key figures who worked with MLK, and then use our catalog & worldcat to order their memoirs.
Importance of diversity in education, specifically in faculty & the impact on student mentoring
Look at old articles in Chronicle of higher education, data from the National Center for Education Statistics, old ERIC articles, and reports in the library catalog using Diversity AND "higher education" AND faculty AND "Student mentoring"
utilization of black bodies specifically in the context of grave robbing by medical institutions in need of cadavers.
depending on your time period, look at Sabin, Historic newspapers, Chronicling America, and the main catalog (limited to your time period). Try a search like (Black OR negro OR colored) AND ("Grave robbing" OR "Grave robber*") AND (medical OR physician*)
Black Wall Street incident of 1921 Tulsa, Oklahoma
Start with historic newspapers, limited to 1921 after May, and try just Tulsa AND riot*. It won't, I think, be called the tulsa race riot or black wall street immediately, so contemporary sources won't use those terms. Look also at our African-American Historical newspaper collections.
the role of race in news coverage of Colin Kaepernick kneeling
Start with our PRIMO catalog and limit to news articles. You can also search Lexis Uni for transcripts of news tv shows. Start just with Kaepernick AND knee* AND (race OR black OR "African-American").