Bing found the following results
Federalism | Definition, History, Characteristics, & Facts
Federalism - Wikipedia
What is Federalism? | Center for the Study of Federalism
Federalism in the United States - Wikipedia
federalism | Wex | US Law | LII / Legal Information Institute
Federalism and the Constitution - Library of Congress
Federalism (Stanford Encyclopedia of Philosophy)
federalism summary | Britannica
Federalism and the Constitution | Constitution Annotated
Exploring Federalism | Center for the Study of Federalism - CSF