Austin’s practical efforts for the cause were unusual. But a fellow resident of Elizabeth, N.J., Elias Boudinot, an aide to George Washington who served as president of the Continental Congress, director of the United States Mint and other important posts, wrote several books urging the new republic to act as patron to the Jews and assist in their return to the territory God promised to Abraham. In a book published in 1816, Boudinot wrote, “Who knows but God has raised up these United States, in these latter days, for the very purpose of accomplishing his will in bringing his beloved people to their own land.”

Why have American Christians been so interested in the fate of the Jews, even decades before the foundation of the international Zionist movement? One reason is that they were members of a society steeped in the Bible. Many historians emphasize the importance of republican sources like Cicero and Livy to the American political tradition. The problem with this argument is that relatively few Americans could read Latin or were familiar with Roman history. Unlike the classics of republican thought, the Bible was universally available and familiar even to those unable to read English. As such, it provided a shared idiom for thinking through matters of public concern.

The availability and familiarity of Scripture made biblical analogies expedient. But the deeper reason the Cyrus model has particularly appealed to Americans is that it placed the United States and its colonial predecessors in what might be called “sacred history” — the Bible’s sweeping story of the creation, corruption and redemption. Since the Puritans, many Americans have wanted to believe that their own endeavors were part of that story. They faced a problem, though: The Bible revolves around the nation of Israel, makes no mention of the New World. By describing their experiences in terms of its central nations, places and figures, Americans have been able to see themselves as participants in the Biblical drama. Some Americans believed that they were themselves a replacement for the biblical Israel, but others contended that they were more accurately compared to Cyrus.

In a political culture formed by the Bible, it has often seemed natural to support a reunion of the people and land that many Americans saw as the model for their own history. Far from representing a weird deviation from norms, evangelicals who see Mr. Trump as a successor to an ancient Persian king are participants in an old American tradition. When, in 1953, former president Harry Truman was introduced as the man who help establish the State of Israel, he grumbled: “What do you mean, ‘helped create’? I am Cyrus!”