Anyone with the slightest knowledge of history can tell you that for most of human history women have held authority over men. In times past men where considered to be the property first of their mother, and then of their wife. The word "father" didn't even exist until the discovery of the male role in reproduction durring the scientific revolution. It wasn't until 100 years ago that men could vote or hold any real political power (and they still can't in some countries!) Not to mention we've never elected a male president in this country. So what if human matriarchy never got established? I know this would require some biological changes, as human females are on average taller, stronger, and heavier then human males, and therefore had an easy time achieving dominance over them in human prehistory, but suppose women weren't larger, would that make a world without matriarchy possible?