Answer:
As an AI language model, I don't have real-time access to specific books like the Kaplan book. However, I can provide you with common reasons for the industrialization of the U.S. in the 1800s. Some of the key reasons for industrialization during that period include:
1. Technological advancements: The United States experienced significant technological advancements, such as the development of the steam engine, the expansion of railroads, and the implementation of new manufacturing techniques.
2. Access to natural resources: The country had abundant natural resources, including coal, iron ore, timber, and other raw materials necessary for industrial production.
3. Population growth and immigration: The U.S. experienced a rapid increase in population, both through natural growth and immigration, providing a large labor force for industrial development.
4. Government support: The government implemented policies that encouraged industrial growth, such as protective tariffs to shield domestic industries from foreign competition and land grants to support infrastructure development.
5. Expansion of markets: The country's vast size, coupled with improved transportation networks, allowed for the expansion of markets both domestically and internationally, providing opportunities for industrial growth.
Please consult the Kaplan book or other reliable sources for specific information regarding reasons for industrialization in the 1800s.