The seventy years of Israel’s captivity had now come to an end, exactly as Jeremiah said it would, and so, the Book of Nehemiah covers the events of the Jews returning from their Babylonian captivity. In the year 538 B.C., the Medes and Persians took over from the Babylonians and became the ruling power of the world.
All the prisoners, including those from Israel, who were formally under the subjection of Nebuchadnezzar the Babylonian king were now under the control of Cyrus, the Medo-Persian king.
Ezra had been in Jerusalem for about 13 years when Nehemiah came to Jerusalem in 444 B.C., so, Nehemiah covers the events between 444 B.C. and 432 B.C.
"And teaching them to obey everything I have commanded you. And surely I am with you always, to the very end of the age."