What wartime scientific breakthroughs resulted in a dramatic reduction in battlefield deaths and also helped contribute to an increase in the average American lifespan after World War II?
A) antibiotics such as penicillin and streptomycin
B) better nutrition
C) vaccines for whooping cough, diphtheria, mumps and measles
D) electric refrigerators
Answer: A
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What constitutional amendment completed the process begun by the Emancipation Proclamation?
A) Eleventh Amendment B) Thirteenth Amendment C) Seventeenth Amendment D) Eighteenth Amendment
Which of the following was a result of the three-field system?
A) It increased the amount of land under cultivation. B) It depleted the soil of nitrogen and other nutrients. C) It made the use of animal manure unnecessary. D) It led to rapidly declining agricultural yields.
Many African Americans objected to the policies of the Reagan administration for all of the following reasons EXCEPT
a. his reluctance to support a national holiday commemorating Martin Luther King, Jr. b. the disproportionately high black unemployment rates that prevailed throughout his presidency. c. the economic burden imposed on black families by his insistence on repeatedly raising federal taxes. d. his determination to decrease the federal government’s spending on social programs such as food stamps and Medicaid.
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