WASHINGTON — The foreign minister of Costa Rica has called on the United States to abandon the Cuban Adjustment Act, calling it largely responsible for attracting tens of thousands of Cubans to Latin American countries, which they then use as a springboard to get to the United States. Foreign Minister Manuel Gonzalez said Costa Rica and other transit countries pay the consequences of the law that all but guaranteed Cubans’ admission to the United States, by permitting those who reach the U.S.