America didn’t become the wealthiest nation on Earth because the Lord promised to bless our nation like He did Israel. There is absolutely no scripture to support such a view. America became wealthy because the freedom to pursue the Christian religion without government interference (separation of church and state) attracted so many faith-filled Christians to its shores that for all practical purposes America became the headquarters for the church on Earth.
As He had promised, God blessed these believers. It’s what came to be known as the Protestant work ethic that produced America’s wealth, and made even average Americans wealthy beyond the expectations of average non-Americans.
Even a cursory study of American history will show that, with few exceptions, our government has always been corrupt, big business has always taken advantage of the little guy, and there’s always been an elite group lurking in the shadows, enriching themselves from the sweat of the common people. Most of our founding fathers were deists. That means they believed in God, but rejected the notion that He would ever involve Himself in human affairs. In spite of their lip service, they never expected God to bless America because deists don’t believe God blesses any nation.
America’s decline began when separation of church and state was reinterpreted to mean that the government could not do anything that was perceived as favoring one religion over another. Having divorced itself from the church, America no longer had any right to the blessings that had come to it because of the church. In seizing the philosophical control of the government, non-believers succeeded only in killing the goose that been laying America’s golden eggs, and in the span of a generation or so America went from being the world’s largest lender to becoming its largest borrower. It was a stunning reversal of fortune.