66
Opinion of the Court
tinction. The ease of travel and the willingness of Americans to visit foreign countries have resulted in numbers of trips abroad that must be of real concern when we contemplate the prospect of accepting petitioners' argument, which would mandate, contrary to Congress' wishes, citizenship by male parentage subject to no condition save the father's previous length of residence in this country. In 1999 alone, Americans made almost 25 million trips abroad, excluding trips to Canada and Mexico. See U. S. Dept. of Commerce, 1999 Profile of U. S. Travelers to Overseas Destinations 1 (Oct. 2000). Visits to Canada and Mexico add to this figure almost 34 million additional visits. See U. S. Dept. of Commerce, U. S. Resident Travel to Overseas Countries, Historical Visitation 1989-1999, p. 1 (Oct. 2000). And the average American overseas traveler spent 15.1 nights out of the United States in 1999. 1999 Profile of U. S. Travelers to Overseas Destinations, supra, at 4.
Principles of equal protection do not require Congress to ignore this reality. To the contrary, these facts demonstrate the critical importance of the Government's interest in ensuring some opportunity for a tie between citizen father and foreign born child which is a reasonable substitute for the opportunity manifest between mother and child at the time of birth. Indeed, especially in light of the number of Americans who take short sojourns abroad, the prospect that a father might not even know of the conception is a realistic possibility. See Miller, supra, at 439 (opinion of Stevens, J.). Even if a father knows of the fact of conception, moreover, it does not follow that he will be present at the birth of the child. Thus, unlike the case of the mother, there is no assurance that the father and his biological child will ever meet. Without an initial point of contact with the child by a father who knows the child is his own, there is no opportunity for father and child to begin a relationship. Section 1409 takes the unremarkable step of ensuring that such an opportunity, inherent in the event of birth as to the
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