Some Bible scholars believe that the prophesies contained in Jeremiah chapters 50, 51; and Revelations 18 talk about the United States.

If so, should Christians be prepared for the coming disasters that will befall America?

America is surely the present Babylon. The one that was spoken of in the book of Revelations 18.

Apart from the bible, I saw a live confession that corroborates with that of the bible.

There's this American guy who came all the way from the USA to Nigeria because he had some spiritual problem and after bumping into some YouTube video of some deliverances occurring in one of the ministries in Nigeria.

He bought his flight ticket and straight away he landed in Nigeria without even an invitation from the ministry. He attended their deliverance service and during the prayer, the spirit of the beast that tormented him began to manifest and confessed some mind boggling things about this world and how they control the governments the world. And when the spirit was asked of where the possessed man lives and where he was coming from, I was very surprised to hear the spirit say that the man was coming from Babylon.

The bible cannot lie. I know that a great calamity will befall America and that calamity will be what will bring about the end of America.

We're in the last days and therefore, we who are waiting for the Lord's appearing should not be asleep, but be alert so that we'll not be taken unawares.

^^
Wow. That's interesting.

A tsunami will wreck the East coast of the US, with earthquakes wrecking the Midwest and parts of California. I've even heard that a false-flag nuclear bomb will explode in either Chicago or Manhattan

but they are xtians