Can you give more reason why you think that verse speaks of the US? It clearly is not in the words of the verses. (Gen 48:18-19)
Do you not believe that all prophecy is to be fulfilled?
There are only a very few nations that could be found to have achieved greatness, The US, and Britain.
Britain is the fulfillment of Ephraim’s great nation that became many nations, and the US is Manasseh’s great nation.
Or you could just cover your eyes and continue down the ditch.
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