More than 90 percent of them are Central Americans , mostly from El Salvador , Guatemala , Honduras and Nicaragua , Amnesty International said in a report this year . The road to Mexico goes through the United States for Mexican . The journey is `` one of the most dangerous in the world , '' rights group says . Thousands of migrants are abused each year by smugglers and drug cartels . Human smuggling may be a 15 business in Mexico .
The road to Mexico goes through the United States for Mexican . The journey is `` one of the most dangerous in the world , '' rights group says . Thousands of migrants are abused each year by smugglers and drug cartels . Human smuggling may be a 15 business in Mexico .