Israel and Judah were related Iron Age kingdoms of the ancient Levant. This history of Israel and Judah runs from the first mention of the name Israel in the archaeological record in 1209 BCE to the end of a nominally independent Judean kingdom in 6 CE.
The two kingdoms arose on the easternmost coast of the Mediterranean, the westernmost part of the Fertile Crescent, between the ancient empires of Egypt to the south; Assyria, Babylonia, and later Persia to the north and east; and Greece and later Rome across the sea to the west. The area involved is relatively small, roughly 100 miles north to south and 40 or 50 miles east to west.
Source: History of ancient Israel and Judah - Wikipedia, the free encyclopedia
The great harlot rests on seven mountains...
The LORD's 'empire' of the Old Covenant was based on Mount Sinai.
The LORD's kingdom is now based off of Mount Zion.
What great, overarching empires were there, oppressing God's chosen people?
Egypt. Assyria. Babylon. Persia. Greece. Rome.
What will be the seventh?
Judging from Daniel's vision, of the feet made of iron mingled with clay, which the Rock not cut with hands will smash, the seventh great overarching empire will be a full-fledged United Nations: atheistic, scientific, and attempting to be monolithic -- yet the iron cannot stand strong with the clay.
You see, the 'ten toes' of the feet in Daniel's vision correlates to the 'ten kings' in Revelation 17, which correlates to the 'tribulation ten days' warning given to the church Smyrna. (Also, the 'receive power one hour' correlates to the 'hour of temptation' spoken of to the church Philadelphia.)
The number 'ten' is likely more symbolic than anything, representing all of the nations that will band together in the confusing times of natural disasters, depleting resources, and overarching lawlessness.