Beresheet (GENESIS) 12:1 Now the LORD said to Avram, "Get out of your country, and from your relatives, and from your father's house, to the land that I will show you. 12:2 I will make of you a great nation. I will bless you and make your name great. You will be a blessing. 12:3 I will bless those who bless you, and I will curse him who curses you. In you will all of the families of the earth be blessed."

But Avram didn't fully obey G-D.

Beresheet (GENESIS)12:4So Avram went, as the LORD had spoken to him. Lot went with him. Avram was seventy-five years old when he departed out of Charan. 12:5Avram took Sarai his wife, Lot his brother's son, all their substance that they had gathered, and the souls whom they had gotten in Charan, and they went forth to go into the land of Kena`an. Into the land of Kena`an they came. 12:6Avram passed through the land to the place of Shekhem, to the oak of Moreh. The Kena`ani was then in the land.

 G-D told Avram to leave his relatives, but Avrah brought along Lot.  Shortly after this, Avrah and Lot's servants came into conflict.  This forced the two parties to split.  But even though they had separated, Avram had to keep rescuing Lot from a variety of troubles.

Beresheet (GENESIS)14:14 When Avram heard that his relative was taken captive, he led forth his trained men, born in his house, three hundred and eighteen, and pursued as far as Dan.

After Lot fled from the destruction of Sodom, his two daughters were fearful that their family would die, so they concocted a plot to preserve their family.

Beresheet (GENESIS)19:30 Lot went up out of Tzo`ar, and lived in the mountain, and his two daughters with him; for he was afraid to live in Tzo`ar. He lived in a cave with his two daughters. 19:31The firstborn said to the younger, "Our father is old, and there is not a man in the earth to come in to us after the manner of all the earth. 19:32Come, let's make our father drink wine, and we will lie with him, that we may preserve our father's seed." 19:33They made their father drink wine that night: and the firstborn went in, and lay with her father. He didn't know when she lay down, nor when she arose. 19:34It came to pass on the next day, that the firstborn said to the younger, "Behold, I lay last night with my father. Let us make him drink wine again, tonight. You go in, and lie with him, that we may preserve our father's seed." 19:35They made their father drink wine that night also. The younger went and lay with him. He didn't know when she lay down, nor when she got up. 19:36Thus both of Lot's daughters were with child by their father. 19:37The firstborn bore a son, and named him Mo'av. He is the father of the Mo`avim to this day. 19:38The younger also bore a son, and called his name Ben-`Ammi. He is the father of the children of `Ammon to this day.

This led to the birth of Moab, who became the father of the Moabite nation, and Benammi, who became the father of Ammonite nation.

The Moabites and the Ammonites frequently harrassed the Israelites throughout the Old Testament (Tanak).  They hindered the Israelites when they were returning to their promised land from Egypt.

Bamidbar (NUMBERS)22:1The children of Yisra'el traveled, and encamped in the plains of Mo'av beyond the Yarden at Yericho. 22:2Balak the son of Tzippor saw all that Yisra'el had done to the Amori. 22:3Mo'av was sore afraid of the people, because they were many: and Mo'av was distressed because of the children of Yisra'el. 22:4Mo'av said to the elders of Midyan, Now will this multitude lick up all that is round about us, as the ox licks up the grass of the field. Balak the son of Tzippor was king of Mo'av at that time. 22:5He sent messengers to Bil`am the son of Be'or, to Petor, which is by the River, to the land of the children of his people, to call him, saying, Behold, there is a people come out from Egypt: behold, they cover the surface of the earth, and they abide over against me. 22:6Please come now therefore curse me this people; for they are too mighty for me: peradventure I shall prevail, that we may strike them, and that I may drive them out of the land; for I know that he whom you bless is blessed, and he whom you curse is cursed.

Centuries later, when the Jews were returning from their Babylonian exile, it was the Moabites and Amonites that tried to prevent the rebuilding of the wall of Jerusalem and Temple.

Nechemyah (NEHEMIAH) 2:10When Sanvallat the Choronite, and Toviyah the servant, the `Ammonite, heard of it, it grieved them exceedingly, because a man had come to seek the welfare of the children of Yisra'el. 2:11So I came to Yerushalayim, and was there three days. 2:12 I arose in the night, I and some few men with me; neither told I any man what my God put into my heart to do for Yerushalayim; neither was there any animal with me, except the animal that I rode on. 2:13 I went out by night by the valley gate, even toward the jackal's well, and to the dung gate, and viewed the walls of Yerushalayim, which were broken down, and the gates of it were consumed with fire. 2:14 Then I went on to the spring gate and to the king's pool: but there was no place for the animal that was under me to pass. 2:15 Then went I up in the night by the brook, and viewed the wall; and I turned back, and entered by the valley gate, and so returned. 2:16 The rulers didn't know where I went, or what I did; neither had I as yet told it to the Jews, nor to the kohanim, nor to the nobles, nor to the rulers, nor to the rest who did the work. 2:17 Then said I to them, You see the evil case that we are in, how Yerushalayim lies waste, and the gates of it are burned with fire: come, and let us build up the wall of Yerushalayim, that we be no more a reproach. 2:18 I told them of the hand of my God which was good on me, as also of the king's words that he had spoken to me. They said, Let us rise up and build. So they strengthened their hands for the good work. 2:19 But when Sanvallat the Choronite, and Toviyah the servant, the `Ammonite, and Geshem the `Arvian, heard it, they ridiculed us, and despised us, and said, What is this thing that you do? will you rebel against the king?

Nechemyah (NEHEMIAH) 4:7 But it happened that when Sanvallat, Toviyah, the `Aravi'im, the `Ammonim, and the Ashdodi heard that the repairing of the walls of Yerushalayim went forward, and that the breaches began to be stopped, then they were very angry; 4:8 and they conspired all of them together to come and fight against Yerushalayim, and to cause confusion therein.

That brings us to today.  What modern nation is descended from the Moabites and Ammonites?  What nation has a capital city called Ammon?  Jordan. 

And where is Ammon, Jordan located?  Over the ruins of the ancient capital of the Ammonites, called Rabbath-Amman.

And what is Jordan?    

The Balfour Declaration in 1921 created a modern home for the Jews in the area of the world referred to as Palestine.  This included  what is now the nation of Jordan.  According to the Peel commission, which investigated the 1936 Arab riots, "the field in which the Jewish National home was to be established was understood, at the time of the Balfour Declaration, to be the whole of historic Palestine, including Transjordan."                                      
Ben Halpern, The Idea Of A Jewish State, (MA: Harvard University Press, 1969) page 21

But in 1921 Colonial Secretary Winston Churchill cut about 80% of Palestine that was to have been part of the Jewish National Home, according to the Balfour Declaration.  It was called Transjordan.  This was a consolation prize to Abdullah, son of Sherif Hussein, for the Hejaz (NW Saudi Arabia, on the Gulf of Aqaba and the Red Sea. Mecca is the chief city) and Arabia going to the Saud family.  Churchill felt the British had to award an emerite to Abdullah because of his help fighting Turkey.