Why did the spanish begin importing slaves from africa to work in the america's beginning in the 16th century?

Which of the following statements is true of cause and effect relationships

According to this contract, when will the sharecropper receive his payment?

When gandhi reached the arabian sea at the end of the salt march, he picked up raw salt from the water and made a declaration: “with this, i am shaking the foundations of the british empire.” how do you think this quotation is symbolic of gandhi’s works and philosophy?