According to the bipartisan House select committee that investigated the incident, the attack was the culmination of a plan by Trump to overturn the election.

Within 36 hours, five people died: including a police officer who died of a stroke a day after being assaulted by rioters and collapsing at the Capitol.

Many people were injured, including 174 police officers. Four officers who responded to the attack died by suicide within seven months. Damage caused by attackers exceeded $2.7 million. It is the only attempted coup d'état directed towards the Federal government in the history of the United States.

https://en.wikipedia.org/wiki/January_6_United_States_Capito...

> It is the only attempted coup d'état directed towards the Federal government in the history of the United States.

The Civil War in the early 1860s doesn't count because they just wanted to secede?

The Civil War wasn't really a coup because the South wasn't trying to take over Washington D.C. or run the Federal government. A coup is usually a quick, behind the scenes power grab by a small group of people trying to unseat a leader. What happened in the 1860s was the exact opposite: it was a massive, public breakup where entire states voted to leave.

the post war assassination of Lincoln was, in a tiny sense, a delusion of coup, perhaps.