I don't think so. Read lots:
http://www.bing.com/search?q=decline+of+the+federalists&form=EDGNTC&qs=PF&cvid=cf2b686daa9848478b95cd3d365ace2f&pq=decline%20of%20the%20federalists
Which event during John Adam's presidency was the main reason the Federalist party began to fall apart?
The XYZ Affair***
The Jay Treaty
The Alien and Sedition Acts
The "Anti-federalist" speech by Thomas Jefferson
4 answers
It's A
The XYZ affair event occurred during John Adam’s presidency was the main reason the Federalist party began to fall apart.
reed is wrong.