Several changes with long-lasting effects on the city occurred in the mid-19th century: their implications can be felt today and lie at the root of the Israeli-Palestinian conflict over Jerusalem. The first of these was a trickle of Jewish immigrants from the Middle East and Eastern Europe. The first such immigrants were Orthodox Jews: some were elderly individuals, who came to die in Jerusalem and be buried on the Mount of Olives; others were students, who came with their families to await the coming of the Messiah, adding new life to the local population. At the same time, European colonial powers began seeking toeholds in the city, hoping to expand their influence pending the imminent collapse of the Ottoman Empire. This was also an age of Christian religious revival, and many churches sent missionaries to proselytize among the Muslim and especially the Jewish populations, believing that this would speed the Second Coming of Christ. Finally, the combination of European colonialism and religious zeal was expressed in a new scientific interest in the biblical lands in general and Jerusalem in particular. Archeological and other expeditions made some spectacular finds, which increased interest in Jerusalem even more.