In this text, Paul unpacks how we got to where we are.  All were once in Adam, and thus all sinned when he sinned.  Sin isn’t just something we do, it is part of who we are.  But just as we were once in Adam and his sin infected us all, we have been invited to be born again in Christ and thus be infected with his righteousness.  In Adam we all experienced death, in Christ we experience eternal life.