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1) Many Americans feared that as immigration increased, jobs and housing would become harder to obtain for a number of reasons:

- There was high unemployment in America after World War One.

- New immigrants were used to break strikes and were blamed for the deterioration in wages and working conditions.

2) Vertical integration helps a company to reduce costs across different parts of its production process. It also creates tighter quality control and guarantees a better flow and control of information across the supply chain.

People would want to use this because it allows them to control their company and the pace they go at.

3) Madam C. J. Walker was “the first African-American woman millionaire in America” and made her fortune thanks to her homemade line of hair care products for black women.

Explanation:

d. dr. francis collins