Rivalries between peoples and kings, grudges, ambition, and a lack of communication saw numerous nations fall to Islam which otherwise may have been able to not only stop, but crush, it.
Today, with our knowledge of history, our ability to communicate instantly, and the military technological advantage we possess, it would take little more than non-Muslim leaders telling the truth about Islam for it to be pushed back to the borders of Muslim lands and constrained until it collapsed under the weight of its own barbarism and ignorance.
Unfortunately, our political, media, and academic elites have been been ignorant cowards.
One by one, ancient lands fell under the sword of Mohammed. Today, the non-Muslim nation closest to being slaughtered to Allah's glory is Israel. Israel may be the main target today, but after they fall, guess who's next?
From Robert Spencer:
Israel stands virtually alone in the world not only because of lingering antisemitism, but because Palestinian Arabs and their allies have succeeded in convincing opinion-makers that their land was taken illegitimately by Israel, and that they are oppressed there. The facts are otherwise, as I have discussed in a previous article here. The state was established legitimately and with the approval of the United Nations, and even the "occupied territories" were obtained according to what have been universally recognized throughout history as the rules of war. (Or should the United States give up the "occupied territories" of California, Texas, and other Western states? Should Russia withdraw from its "occupied territories" in Konigsberg, eastern Finland and eastern Poland? Should Muslims across North Africa, the Middle East, Iran, India and Southeast Asia withdraw from those "occupied territories" back to Arabia?) While I am sympathetic to genuine Palestinian Arab refugees, and with my friends from Ramallah and Jenin, I can't help but notice the role of the neighboring Arab states in exacerbating and prolonging the refugee problem for political reasons that are ultimately rooted in the jihad ideology. I can't help but notice that I was able to visit the Church of the Holy Sepulcher, Mount Tabor, and other Christian holy sites in Israel, which mean a great deal to me personally, while Bethlehem, under Palestinian Authority control, has become a dangerous place from which Christians are fleeing as quickly as they can. I can't help but notice that there was no call to establish a Palestinian state in the West Bank and Gaza between 1948 and 1967, when those territories were under Jordanian and Egyptian control respectively -- despite the alleged difference of nationality between Palestinians and Jordanians and Egyptians.
Ultimately, if the nations of the world are interested in defending universal human rights and the equality of dignity of all people, they need to stand with Israel. Misdiagnosis of the problem -- that is, the unwillingness or inability of Western governments to acknowledge the motives and goals of the jihadists who want above all to destroy them -- has largely prevented this.
Yet as Benjamin Franklin said long ago in a far different context, we must all hang together, or we will most assuredly all hang separately.