Most abolition did not occur until after 1850 in the regions that heavily relied on plantation products, such as the United States, Brazil, and Cuba. Slavery was abolished in the U.S. in 1865 following the passing of the 13th Amendment. The end of the slave trade in Brazil, though technically ended in 1830, did not end until British intervention in the 1850s, and the abolition of slavery entirely did not occur until 1888 after the war with Paraguay opened political eyes to the injustice of slavery. British colonies in the Caribbean ended slavery in 1838, French colonies followed a decade later, and the Dutch followed in 1863. Spain did not abolish slavery in Puerto Rico and Cuba until 1886.