Well most people used gun powder for guns
The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
A woman must have permission and an escort to attend the Hajj because that is what the Muslim religion stated in its religious principles. Muslim law establishes that any woman below 45 years old that wants to make the trip to Mecca to participate in Hajj, must be accompanied by a male chaperon that is going to serve as a guardian. Otherwise, women can't attend this Muslim tradition. Women who are older than 45 can make a trip in groups, but they need a notarized letter authorized by the husband or son.
That is how strict Muslim law is to women.
Open Door policy, statement of principles initiated by the United States in 1899 and 1900 for the protection of equal privileges among countries trading with China and in support of Chinese territorial and administrative integrity.
I'm not sure of his name, but it might have been Darius. If you want more info, search 'Gordian Knot'. There was supposedly a prophecy at the time stating that whoever could untie this immensely complicated knot that tied the king's horse yolk to his chariot would rule over Persia. When Alexander saw the knot he sliced it in two with his sword instead of trying to untie it. I'm pretty sure Darius (or whatever his name was)