I think that your point confuses islamic state with a muslim majority state. While almost all muslim majority states allow women to vote(even though some only quite recently like saudis), islamic state would be different. This is of course same for any fundamentalist state like a jewish one or christian one. They are incompatible with democracy.

US did not ever have slavery! Because noone was slave there except black people if they were not free.

Some hard hitting facts right there. I betcha you didnt know this.