By the 1840s, what was the North's biggest business? A:A. factories.B:B. tobacco.C:C. railroads.D:D. textiles.

To determine the North's biggest business by the 1840s, we need to consider the economic activities that were most prevalent in that period.

1. Analysis of Options:

   • A. Factories: The rise of industrialization saw a significant increase in factories, especially in the North.
   • B. Tobacco: Tobacco was predominantly produced in the South rather than the North.
   • C. Railroads: The railroad industry was rapidly expanding in the North and played a vital role in transportation and commerce.
   • D. Textiles: The textile industry was one of the leading sectors in the North, particularly in New England, during the early industrial revolution.

2. Historical Context: In the 1840s, the North was experiencing rapid industrial growth, particularly in manufacturing and textiles. The textile industry, especially cotton mills, became a cornerstone of the Northern economy, driven by the demand for clothing and other fabric products.

Given this analysis, the North's biggest business by the 1840s was predominantly in textiles, which had a significant impact on its economy.

Final Answer

D. Textiles