Hillary Clinton is a great example of why women are incompetent to become president. First of all there is no leader of any great country that I know of has a women as a leader, and even if they do, most of it's parliament and government is run by men. I do not understand why politicians such as Hillary are playing the sex card to get other lower-sex people to cast their vote for her. Why can't the race just be a group of men like it has for the last 200 years? We already have muslims trying to destroy the world and black monkey's destroying our infrastructure, we do not need women to ruin our political system as well.
I believe women would do just fine running a nation. We have women in out Supreme Court, in Congress, serving in the army, helping this nation grow, so why can't a woman run the nation? I don't believe that all women are physically and mentally weaker to believe that it would be a sexist claim putting all women in one group and saying they are all the same in that regards. There have been intelligent women who would be great presidents and there are terrible men who should never be president, there are great men that should be president and there are terrible women who should not be president. Gender shouldn't be the deciding factor. (Although I don't think Hillary should be President)
Men and women can both run a country, except maybe a man runs it better. Most countries are ruled by men for a reason, because they are physically tougher and mentally stronger, as in the title of the question, but there is the occasional country (like Nazi Germany) that is run by women.