You might do the following Google Search:
TOPIC + TIMELINE
TOPIC + CHRONOLOGY
e.g. Civil Rights Movement Timeline
Vietnam War Chronology
*Make sure you are using authoritative, credible sources, such as museum websites, archives, documentary/television productions, libraries, and educational and historic organizations, whose work is accurately identifying archival items (photographs, posters, artifacts, etc.).
You can limit your online search to credible sources by using this formula when searching Google.
Your topic, followed by a colon (:), followed by .edu or .gov
Voting Rights Act of 1965:.edu
This will limit your search results to college and university websites or government publications, which are authoritative, credible sources.
The Library of Congress is the largest library in the world, with millions of books, recordings, photographs, newspapers, maps and manuscripts in its collections. The Library is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office.