No it wasn’t. Stealing land? Sure. Forced religious conversion? Sure. Invasion and occupation? Sure.
Genocide, though, only really started in this millennia. Before that, land conquest would just involve replacing the government and institutions, not killing/displacing the local population to have them replaced with settlers. It just didn’t make sense for most of human history.
Not to say things were good! Instead of genocide, the more common tactic throughout history was mass enslavement.