Historical american slavery is different mainly due to the fact that people were born into with no recourse. This is a major difference in comparison with most other forms of historical slavery (war, raids, and debt) in that there was a fundamental sense of inherent worth of being born "less than". There is also more awareness as modern blacks have been barred from establishing their own culture independent from that of "white" america and so, keep the struggle alive.

Modern slavery is a problem, yet with globalization, it is seen as more of a national problem, in that "sucks if your country can't protect its citizens". Unfortunately, with the rampant hypocrisy of the UN security council nations, it's next to impossible to take any real action without a veto based on violating national sovereignty.

As for Islam, similar to most other religions, it's more about the people who practice, than the texts themselves. In the golden age of Islam, the texts were the same, yet their culture valued knowledge and science. In each era, organized religion is merely used as a political tool to move the masses and exercise power; it's the same today. We run into the same political issues regarding international treatment of women, it's a national issue and nothing will be done unless the greedy politicians see a profit to be had.

While we are distracted by the debate, the ones in power give zero fucks and only chase the money; so if we want change to occur, we need to talk and figure out what we DO agree on and make change happen.