These newcomers are well indoctrinated; four of the sample questions on our naturalization test ask about Pilgrims. Nothing in the sample exam suggests that prospective citizens need know anything that occurred on this continent before the Mayflower landed in 1620. Few Americans do, after all.
The Spanish didn't just explore, they settled, creating the first permanent European settlement in the continental United States at St. Augustine, Fla., in 1565. Santa Fe, N.M., also predates Plymouth: later came Spanish settlements in San Antonio, Tucson, San Diego and San Francisco. The Spanish even established a Jesuit mission in Virginia's Chesapeake Bay 37 years before the founding of Jamestown in 1607.