He has brought down the mighty from their thrones and exalted the humble and meek.

The angel Gabriel had astonished Mary by not merely announcing that she was pregnant but her son would:
 be great and will be called the Son of the Most High. And the Lord God will give to him the throne of his father David, and he will reign over the house of Jacob forever, and of his kingdom there will be no end.” Luke 1

Mary's understanding was that her son would re-establish the true Kingdom and would
"bring down the mighty from their thrones and exalt those of humble estate;"

Her son would be no ordinary king and His kingdom would be more than a worldly dominion but would be the Kingdom of heaven.

Her son was to be the child born to a virgin as Isaiah predicted:

For to us a child is born,
to us a son is given;
and the government shall be upon his shoulder,
and his name shall be called
Wonderful Counselor, Mighty God,
Everlasting Father, Prince of Peace.
Of the increase of his government and of peace
there will be no end,
on the throne of David and over his kingdom,
to establish it and to uphold its
with justice and with righteousness
from this time forth and forevermore.
The zeal of the LORD of hosts will do this. isaiah 9

He was to be a warrior king like David but not against the Romans or the puppet King Herod from whom, very soon, Mary and Joseph would flee in terror as refugees into Egypt.

His fight was against the spiritual prince who had wrested sovereignty from his ancient ancestor Adam, in far off Eden, a fight which would initially take place in the desert as He was tempted by worldly might and glory and reach a conclusion in another garden, where He triumphed over everything the temptor could throw at Him. He set his face resolutely to die on a Roman cross, and be completed by His Father as He raised him triumphantly from the grave, overcoming death, sin  and the grave for ever.

The territory which He had to offer was not just ancient Israel it would be both New Heavens and New Earth. 

The new promised land, the Kingdom of heaven, which He would start His ministry proclaiming; would be present in the hearts and minds of all who believed in Him as he made His home in their inmost beings as a foretaste of all that will come when He returns in His final triumphant parade bringing to completion all that He has already accomplished.

Each day His true followers bring forward that Kingdom as they bring Heaven down to Earth in the familiar words of the Lord's prayer. Thy Kingdom come, Thy will be done on earth as it is in heaven.  

     
Let each of us today do what we can to bring forward His coming again, with kind words and deeds, so that we too will soon be looking into His adorable face, just as Mary did with her baby, those many years ago.