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Sound waves. I hope this helps.
Arc1720 the primary innovators in high-rise design during the late 19th century were those associated with architectural styles and ideas of what was appropriate in the way of ornamentation and building features, considering the purpose of the building, it's cost, and its location.
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Brown v. Board of Education was a landmark judicial ruling by the United States Supreme Court that declared that state laws that established separate schools for African-American and white students denied equality of educational opportunities.
The ruling was delivered on May 17, 1954, unanimously (9-0) by the Warren Court; and established that "separate educational facilities are inherently unequal". With this, the Supreme Court reversed the existing precedents from Plessy v. Ferguson of 1896. As a result of this ruling, racial segregation came to be considered as a violation of the Equal Protection Clause of the Fourteenth Amendment to the United States Constitution. This ruling opened the way for racial integration and achieving civil rights for African Americans.
