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Here are some viral video hashtags popular in the USA:

General Viral Hashtags:

#Viral

#Trending

#ForYou

#FYP

#ExplorePage

#MustWatch

#ViralVideo

Niche-Specific Hashtags:

Entertainment & Fun:

#FunnyVideos

#Comedy

#PrankWars

#MemeLife

Challenges & Trends:

#ChallengeAccepted

#TrendAlert

#DanceChallenge

#TikTokTrend

Lifestyle & Motivation:

#Inspiration

#LifeHacks

#GlowUp

News & Events:

#BreakingNews

#USAnews

#CurrentEvents

Let me know if you need more specific ones for your content!