Yeruwshalaim

Metaphorically speaking, there is a hub around which a huge wheel turns. There is a sun around which planets revolve. There is a nucleus around which electrons orbit. As important and central as this hub, sun, or nucleus is to our spiritual walk, we don't give it much thought, prayer or recognition. We tend to neglect it, but it is by this center, or "hub", that nations will rise or fall- our nation, your nation, all nations, regardless of continent or hemisphere. That "hub" is Jerusalem.
On the long timeline of history, we are currently living in the age of nations (goyim). Nations didn't always exist. In fact many nations are relatively new, but today there is no territory on earth that has not been mapped, bordered in, and defined as being within a nation. One of the last nations to be carved out of the earth, mapped with boundaries set, with the official approval of the other nations: Israel. The completion of this age of nations brought with it the beginning of the countdown of a scriptural prophetic clock. Jesus spoke of the significance of the completion of the age of nations and its connection to Jerusalem, which was also translated to us from the Greek as "the time (meaning includes: a limited period of time, a fixed and definite time; the time when things are brought to crisis, the decisive epoch waited for) of the Gentiles (meaning includes: a tribe, a nation, a people group)" (Lk. 21:24). Around that time in history when Jesus prophesied, there were few independent or self-governing nations. With a few exceptions, most of the earth was sectioned into huge empires, vast barbarian territories, a few city-states, and uncharted whole continents. His audience must have wondered what Jesus was talking about, but now, we can see it and understand it.
All nations are going to be drawn, and are now being drawn to an ultimate destination, and that destination is Jerusalem. What happens to those nations will depend upon how they deal with Jerusalem. This is the word of the LORD:
"Behold, I will make Jerusalem a cup of drunkenness to all the surrounding peoples, when they lay siege against Judah and Jerusalem. And it shall happen in that day that I will make Jerusalem a very heavy stone for all peoples; all who would heave it away will surely be cut in pieces, though all nations of the earth are gathered against it...In that day the LORD will defend the inhabitants of Jerusalem; the one who is feeble among them in that day shall be like David, and the house of David shall be like God, like the angel of the LORD before them. It shall be in that day that I will seek to destroy all the nations that come against Jerusalem."   Zech. 12:2-3, 8-9
The nations are raging as never before. Frightening headlines of deep espionage and sabotage, underhanded election tampering, aggression, warfare, attacks and counter-attacks, assassination, missiles, nations blatantly supporting terrorist organizations, fill our eyes and ears daily. The LORD connects all of these things to the coming of His Anointed (Christ), His Son in Psalm 2:
"Why do the nations rage, and the people plot (imagine, growl, utter, mutter, fervor of mind, devise, roaring) a vain thing (emptied, worthless, fruitless)? The kings of the earth set themselves...against the LORD and His Anointed ("Messiah")..."  v. 1-2
In this Psalm the LORD guarantees:
"Yet I have set My King on My holy hill of Zion."  I will declare the decree: The LORD has said to Me, "You are My Son, today I have begotten You...I will give you the nations for Your inheritance, and the ends of the earth for Your possession." v. 6-8
The nations, and the spiritual strongholds over them (Dan. 10:12-14, Eph. 6:12, Rom. 8:38-39, 2 Cor. 10:4-6), do not want to belong to the Messiah, their anointed and appointed King. They rage and writhe against the decree of God. They plot, kill, and destroy on a scale never seen before. Eventually they will all turn against the place from which the Word and Law of God flows which is Jerusalem, as we will see.
It is important here to look at the meaning of the word Jerusalem, the original Hebrew being Yeruwshalaim. Simply put, the word means, "teaching of peace". The use of the verb "teaching" means it is an ongoing activity. It was before, it is now, and it is continuing into the future. The Hebrew root word is "yara", meaning archers, to shoot (an arrow), instructed, teacher, flow as water (rain), to point out, aim the finger, i.e. to teach. The second root word that makes up the word "Yeruwshalaim" is "shalam". It means peace and more: "peace, to make peace, to recompense, to repay, to restore, restitution, amends, make safe, to complete and perform, to make an end of that is perfect, prosperous, reward, to live friendly, to submit oneself to the dominion of any one".
We can see the importance of this meaning of Yeruwshalaim, or Jerusalem, and the importance of its fulfillment in these verses from the prophets Isaiah and Micah:
"...concerning Judah and Jerusalem...Now it shall come to pass in the latter days that the mountain of the LORD's house shall be established on the top of the mountains, and shall be exalted above the hills; and all nations shall flow to it. Many people shall come and say, "Come, and let us go up to the mountain of the LORD, to the house of the God of Jacob; He will teach us His ways, and we shall walk in His paths." For out of Zion shall go forth the law, and the word of the LORD from Jerusalem. He shall judge between the nations, and rebuke many people; and they shall beat their swords into plowshares, and their spears into pruning hooks; Nation shall not lift up sword against nation, neither shall they learn war anymore. O house of Jacob, come and let us walk in the light of the LORD."  Isa. 2:1-5, Micah 4:1-3
The Law, the Word, and the teaching of the LORD will go forth from Jerusalem and Zion, and the nations will be taught and learn peace.
There is an interesting story about this verse above from Isaiah. The United Nations in New York City is a very impressive building inside and out. Across a wide avenue from the U.N., there is a small park named for the first African-American to win the Nobel Peace Prize, Ralph Bunche*. Inside that small park a wall was built that faces the U.N.. An excerpt from the verse above from Isaiah was carved into that wall, but there was no attribution to Isaiah under the carved quote. A decade later, a group of citizens went to Mayor Koch and told him that the name of Isaiah should be added beneath the quote, and he agreed to add it. That wall facing the U.N. has been referred to as "the Isaiah Wall" since that day (see here). The prophecy of Isaiah regarding the nations of the earth faces the one place on earth where all of those nations meet daily. It is the nature of the Word of God that all creation must eventually manifest it, or conform to it, and so must the nations.
Our governments wrestle continually with how to deal with the dangerous events among the nations today. However, scripture has told God's people what to do. David prophesied/wrote/sang of the importance of Jerusalem in this matter, "For the thrones are set there for judgment, the thrones of the house of David. Pray for the peace of Jerusalem: "May they prosper who love you. Peace be within your walls, prosperity within your palaces." For the sake of my brethren and companions, I will now say, "Peace be within you." Because of the house of the LORD our God, I will seek your (Jerusalem's) good." 
                                                                                                    Ps. 122:5-9
David said that for many reasons, it is required of us to pray for the peace of Jerusalem, and all that its meaning contains.Do the headlines and threats of war alarm you? Are you concerned about the havoc surrounding the nations of the earth? Pray for the peace of Jerusalem, because the fates of all of the nations are directly tied to it. Within our prayers is the understanding that Jerusalem is indeed a physical place, but it also encompasses a meaning and truth for our age and for all time that prophesies regarding Zion, the Mountain of the LORD, the House of God, the thrones of judgment, the thrones of David, the out-flowing of the Law and the Word of God, the "teaching of peace" to all people and nations. Jerusalem is the sun, and all the nations revolve round it, whether they know it or not. As we pray for the peace of Jerusalem, we are praying the will and Word of God, and we are also praying for the nations, even the darkest and most oppressive of them, for God has promised that His kingdom will be composed from every nation, kindred, tongue and tribe (Rev. 5:9-10, 7:9-10).

Our Father has commanded us to "Pray for the Peace of Jerusalem".

*Ralph Johnson Bunche ( August 7, 1904 – December 9, 1971) was an American political scientist, academic, and diplomat who received the 1950 Nobel Peace Prize for his late 1940s mediation in Israel. He was the first African American to be so honored