Kingdoms differ in culture, learning, laws, religion, traditions, and governance.
The major difference between the Babylonian and the Medo-Persian kingdoms was in their governance. Nebuchadnezzar of Babylon, was an absolute monarch, so his word was the law.
Daniel 5:19 NKJV
“And because of the majesty that He gave him, all peoples, nations, and languages trembled and feared before him. Whomever he wished, he executed; whomever he wished, he kept alive; whomever he wished, he set up; and whomever he wished, he put down.”
Darius the king of the Medo-Persian empire did not have the absolute powers of Nebuchadnezzar.
Daniel 6:15 NKJV
“Then these men approached the king, and said to the king, “Know, O king, that it is the law of the Medes and Persians that no decree or statute which the king establishes may be changed.”
Darius was subject to the unchangeable laws of his own kingdom.
The leaders around Darius manipulated him to make a law and they then used the law to fight him.
Daniel 6:6 NIV
“So these administrators and satraps went as a group to the king and said: “May King Darius live forever!”
They proposed a new law.
Daniel 6:7 NIV
“The royal administrators, prefects, satraps, advisers and governors have all agreed that the king should issue an edict and enforce the decree that anyone who prays to any god or human being during the next thirty days, except to you, Your Majesty, shall be thrown into the lions’ den.”
They convinced Darius to sign their wicked decree. They hid their evil agenda against Daniel from him.
Daniel 6:8 NIV
“Now, Your Majesty, issue the decree and put it in writing so that it cannot be altered—in accordance with the law of the Medes and Persians, which cannot be repealed.”
Darius tried in vain to break his own law to save Daniel.
May God’s eternal and benevolent kingdom be established in your life. May you prosper greatly, in Jesus’s name.