I think I filled you in about Zemo after that big brawl in Sokovia? Because of Steve and I being splitsville after Hulk-you disappeared and then You-you crash landed later on at Strange's spook palace.
Zemo's the guy that busted up the Avengers during the Sokovia Accord bickering. And the Accords happened because our fight with Ultron caused nearly five billion bucks in damages and killed 177 people.
Including Zemo's entire family. And an American kid named Charlie Spencer, who happened to be in Sokovia building sustainable housing for the poor.