19765
Herbert S. Klein , a historian of Latin America at Stanford and an author of studies on slavery in the region , said , '' The slave trade was in full development by the mid-16th century and would have brought African slaves to Mexico , though the primary work force remained Amerindians . ''
 location contains: Latin America, Mexico
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 location contains: Latin America, Mexico