The answer is crops. Hope i helped
<span>After conquering North Africa, the Ummayad Caliphate proceeded to conquer Spain. This conquest took place from 711 to 788 AD. The long-fought war of expansion completely destroyed the existing Visigothic Kingdom, founding the independent Emirate of Całrdoba in its place. This Emirate was overseen by Abd ar-Rahman I, a man who finished the unification of Muslim-ruled Iberia. This war was the furthest West that Muslim rule ever extended into Europe.</span>
First of all, the story of Abraham Lincoln is a prime example of the American dream, that one can rise from humble origins to achieve greatness. So this compelling story should be told and retold to every generation of Americans to instruct and inspire them to become the best that they can be.
A second reason for students to learn about Lincoln is his great significance in American history. Lincoln's story sheds light on a turning point in American history, the Civil War. As president of the federal government during America's greatest crisis, Lincoln made great decisions that saved the United States from disintegration. And his decisions shaped the future of America.
Given his huge impact on American history, most historians today consider Lincoln to be the greatest president the United States ever had. So students need knowledge of Abraham Lincoln in order to understand how and why America became as it is today.