Lower wages, Rising unemployment, labor strikes
They where very big in land amount. hope this helps
Answer: I think the answer is "It weakened attempts to abolish slavery."
Simple. The Columbian Exchange exchanged diseased, people, plants, food, and animals. The Americas adapted with new plants and animals like cattle, chicken, etc., and more slaves. Europe gained potatoes, tomatoes, corn, squash, punpkin, etc.
New societies could depend on new sources of food, new animals. That also improved their local economy, and knowledge (learning)
The answer is true, and the book he wrote is called "The Jungle", which he wrote in 1906.
