1) Iron Man vs. Captain America (Captain America: Civil War, 2016)

Iron Man and Captain America fought because they disagreed about government control over the Avengers. Iron Man supported regulation to prevent future disasters. Captain America believed it would limit their freedom and make them tools for political agendas. The fight got personal when Iron Man found out Bucky killed his parents while under mind control. Captain America and Bucky overpowered him and left the Avengers broken. The split weakened the team when Thanos later attacked. This fight stood out because it forced heroes to turn against each other and left fans divided about who was right.
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