Travelers risk being turned away at U.S. customs , as entry rules come into effect . A British Foreign Office report on travel trends for 2009 predicted that 13 percent of British travelers are more likely to visit the States now Canada allows short - stay residents under the visa waiver program entry to the U.S . Visitors must submit documents online at least three days before they enter .
Travelers risk being turned away at U.S. customs , as entry rules come into effect . Canada allows short - stay residents under the visa waiver program entry to the U.S . Visitors must submit documents online at least three days before they enter .