Migration from the countries of northern Central America to the United States has been reduced by more than 75% since last May, US interim Secretary of Security Chad Wolf said.
Many international observers say the country -- with 60 percent poverty -- is in no shape to welcome refugees but simply signed the agreement under intense US pressure.
The UN urged countries Tuesday to take joint responsibility for caring for surging numbers of displaced people, while wealthy nations faced criticism for not shouldering their "fair share" of the burden.
