The slave trade began in the15th century. Broadly speaking, the slave trade was first conducted by Arabs, Turks and black slave traders. In a narrow sense, the slave trade refers to the European colonists selling African blacks to the United States as slaves, and a large number of African blacks came to the United States. Modern western colonial expansion began in Africa, Portugal and Spain were the earliest countries to colonize, and Portugal was the first country to engage in slave trade. Britain is the country with the largest slave trade in the world. [1] In modern human history, the slave trade wrote the most shameful and despicable page. Greedy western colonists regarded a large number of African blacks as slaves. According to statistics, during the 400-year-long slavery process, tens of millions of African blacks were killed. Santo Domingo imported 2.8 million slaves in the first half of the18th century, but by 1976, there were only more than 65,000 slaves left, with an average of more than 40,000 deaths each year. According to the calculation method that every slave shipped to the United States must sacrifice at least 10 African blacks, the slave trade has caused Africa to lose 1 100 million people, equivalent to 1980 Africa's total population; Liverpool ships engaged in 900 slave trade trips, and the slaves sold were sold at the price of150,000 pounds, with a net profit of120,000 pounds. Who knows how many innocent black people died?