So with the other individual movies (Thor, Iron Man, The first two Cap' films), individual avengersAvengers may play cameos ofor supporting rollsroles. In the avengersAvengers films, it has been a collaborative effort with no individual getting a significantly larger amount of screen time than the others.
In Civil warWar, Tony starkStark gets at least as much screen time as Steve Rogers, and some of the others (Natasha Romanoff, Vision, Wanda Maximoff) come pretty close to getting a "co-star" level of screen time as opposed to "supporting cast".
Given all of that, what executive and marketing decisions lead to Civil War being billed a Captain America movie?