Why Did Railroads Become the Key American Industry in the Nineteenth

question 23

Short Answer

Why did railroads become the key American industry in the nineteenth century?

Explain the mechanism and importance of primary and secondary circular reactions in cognitive development.

Understand the concept of vocabulary acquisition and sentence structure in early language development.

Understand the stages and substages of cognitive development in infants according to Piaget's theory.

Identify the phenomena of object permanence and its developmental timing.

---

Definitions:

Net Income

The total profit of a company after all expenses, taxes, and costs have been subtracted from total revenue, indicating financial health.

Return On Assets

A financial metric that measures the profitability of a company in relation to its total assets.

Profit Margin

A financial metric that measures the amount of net income earned with each dollar of sales by calculating the percentage of revenue that translates into profits.

Annual Depreciation

The yearly accounting charge representing the cost allocation of the value of an asset over its useful life.