Here are the answers to your statements:
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True - Brown v. Board of Education (1954) did indeed overturn the ruling of Plessy v. Ferguson (1896), which upheld the constitutionality of racial segregation under the "separate but equal" doctrine.
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False - The National Interstate and Defense Highways Act was enacted in 1956, while Levittowns began to emerge in the late 1940s and early 1950s. While both are related to post-World War II suburban expansion, the Act was not created as a direct consequence of Levittowns.
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True - The success of Sputnik I, launched by the Soviet Union in 1957, prompted the United States to prioritize STEM (science, technology, engineering, and math) education to compete with Soviet advancements in technology and space exploration.
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True - McCarthyism refers to the period in the early 1950s when Senator Joseph McCarthy led a campaign against alleged communists in the United States, leading to widespread accusations and severe limitations on civil liberties.