In the mid-1840s Famine due to potato blight was the main cause of massive Irish immigration to the United States which destroyed the staple food of the Irish diet. Thousands of the peasants were driven from their cottages due to hunger, poverty and were forced to Immigrate to North America. These peasants had no skill and experience of adaptation to the new country. However, many immigrants also died while crossing the ocean due to diseases and ships were known as coffin ships.
I think the best answer is that farmers demand to stop crop-lien system. During the 1800s, the Farmer's Alliance was organized. It is an organization among American farmers where one of their goal is to end crop-lien system. Crop-lien system is where farmers are allowed to grow crops in the lands of merchant however the money they get from the crops are first given to the merchant and what's left is for them which is only a small amount.
The Qin dynasty was the first dynasty to start connecting the various walls into a greater whole. That happened around 221 to 206 BC and was done under the reign of Qin Shi Huang. Though the wall was later improved still by other dynasties, it was during the Qin dynasty that the Great Wall of China was first formed into a cohesive structure.
