In the early 1950's dr jonas salk developed an effective vaccine for what childhood disease
a) polio
b)measles
c)chicken pox
d)typhoid fever

Review the following types of government and match the style to it's definition type of dictatorship in which one person has complete control of the government government in which the people elect representatives to make government decisions for them government in which all people directly participate in government decisions government power is shared between a national government and regional (state) governments government has almost complete control; makes most decisions government power is centralized in regional (state) governments and they work together in a loose national government 1. authoritarian government 2. autocracy 3. confederal government 4. direct democracy 5. federal government 6. representative democracy

Which of the following was used only once, to ratify the 21st amendment (repealing prohibition)? a. three-fourths of both houses of congress. b. three-fourths of the state legislature approved it. c. two-thirds of the state legislature approved it. d. ratifying conventions in three-fourths of the states approve it.

Which of these were effects of mass production techniques used during 1920s