Isaiah prophesies against Samaria and Jerusalem; Samaria/Israel falls and its people exiled permanently to Assyria, and here’s why: Isaiah 28−29; 2 Kings 17:1−5; 2 Kings 18:9−12; 2 Kings 17:6−41; Isaiah 1:1−20
It was the end of the northern kingdom. Israel fell to Assyria after a three-year siege of Samaria. Why did God let this happen? The short explanation is:
2 Kings 18:12 For they refused to listen to the Lord their God and obey him. Instead, they violated his covenant—all the laws that Moses the Lord’s servant had commanded them to obey.
The problems started when Israel, under Jeroboam, split from Judah and started worshipping two golden calves. Pleas to return to God were ignored:
2 Kings 17:13 Again and again the Lord had sent his prophets and seers to warn both Israel and Judah: ‘Turn from all your evil ways. Obey my commands and decrees—the entire law that I commanded your ancestors to obey, and that I gave you through my servants the prophets.’
The ten tribes were deported (those on the eastern side of the Jordan had been deported earlier, by the previous Assyrian king). They are now known as the ‘ten lost tribes’.