The 13th, 14th, and 15th Amendments were designed to grant freedom to slaves (end slavery), grant citizenship to the African American men, and give African American men suffrage (the right to vote). The goal of the amendments was to make it easier for slaves to transition and be able to participate in our democracy.
The correct answer is African Americans. Many of them joined the workforce because many came home as veterans from WW1 or didn't come back at all, which meant that people now needed more people to work, so African Americans started working more in various industries and manufacturing plants.
A Religious leader of iran
They had a greater army and they had many more supplies which were needed to fight and conquer the large stretches of Africa and Asia after 1880.