Mexicans have an important African heritage. Between 100,000 to 200,000 African slaves were brought into Mexico during the 16th through 18th centuries, nearly a quarter the number brought to the USA. In 1646 there were 35,000 African slaves in Mexico, more than 2.5 times the white (Spaniard) population These slaves represented about 12% of the total population, roughly equal to the percentage of slaves in the USA before 1860.
Mexico’s second president, Vicente Guerrero, whose mother was partially Black, abolished slavery in 1829. Thousands of Blacks escaped into Mexico from the US before the Emancipation Proclamation in the US...However, today there are very few black faces in Mexico. If one pays close attention, they can identify people of African heritage in a few selected communities in Veracruz and along the Costa Chica in Guerrero and Oaxaca.
What happened to all the Blacks in Mexico? They assimilated by having offspring with other racial groups. In colonial times, the Catholic Church went to great lengths to categorize intermixed races for marital and baptism purposes. Before too long, nobody could keep all the combinations straight! Eventually, everyone of mixed race was considered a mestizo. The African portion was purposely or accidentally dropped.
Mexico began to gradually abolish slavery soon after it declared independence from Spain in 1821. The Mexican Congress fully outlawed slavery in 1837, well before the United States did so with the 13th Amendment in 1865. Texas won its independence from Mexico in 1836 and eventually joined the U.S. as a slave state.
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Source:https://geo-mexico.com/?tag=ethnicity