The Question and Answer section for The Federalist Papers is a great resource to ask questions, find answers, and discuss the novel.
In large republics, factions will be numerous, but they will be weaker than in small, direct democracies where it is easier for factions to consolidate their strength. In this country, leaders of factions may be able to influence state governments...
I have no access to the history textbook you're using in your class. Which of the essays in the Federalist Papers does your question pertain to?