Answer: A. drought
Explanation:
It is A because their environment changed alot so it was difficult to grow corn and so the migrated south where it rained more.
Flooding rivers helped contribute to the beginning of farming communities because of sediment deposits that would be spread beyond the banks of the river to the land near rivers. This sediment helped to create highly fertile land that could then be used for farming. The mineral rich sediment helped to develop early farming and allowed for the natural cycle of rivers to boost agricultural production.
Presidential Reconstruction
In 1865 President Andrew Johnson implemented a plan of Reconstruction that gave the white South a free hand in regulating the transition from slavery to freedom and offered no role to blacks in the politics of the South. The conduct of the governments he established turned many Northerners against the president's policies.
The end of the Civil War found the nation without a settled Reconstruction policy.
In May 1865, President Andrew Johnson offered a pardon to all white Southerners except Confederate leaders and wealthy planters (although most of these later received individual pardons), and authorized them to create new governments.
Cyrus McCormick was born on February 15, 1809, in the Shenandoah Valley of Virginia. He was the eldest of eight children born to inventor Robert McCormick, Jr. (1780–1846) and Mary Ann "Polly" Hall (1780–1853). As Cyrus' father saw the potential of the design for a mechanical reaper, he applied for a patent to claim it as his own invention. He worked for 28 years on a horse-drawn mechanical reaper to harvest grain; however, he was never able to reproduce a reliable version. Cyrus took up the project. He was aided by Jo Anderson, an enslaved African American on the McCormick plantation at the time. A few machines based on a design of Patrick Bell of Scotland (which had not been patented) were available in the United States in these years. The Bell machine was pushed by horses. The McCormick design was pulled by horses and cut the grain to one side of the team. Cyrus McCormick held one of his first demonstrations of mechanical reaping at the nearby village of Steeles Tavern, Virginia in 1831. He claimed to have developed a final version of the reaper in 18 months. The young McCormick was granted a patent on the reaper on June 21, 1834, two years after having been granted a patent for a self-sharpening plow. However, none were sold, because the machine could not handle varying conditions. The McCormick family also worked together in a blacksmith/metal smelting business. The panic of 1837 almost caused the family to go into bankruptcy when a partner pulled out. In 1839 McCormick started doing more public demonstrations of the reaper, but local farmers still thought the machine was unreliable. He did sell one in 1840, but none for 1841.
