How did presidential addresses and supreme court rulings begin to change the lives of the american people beginning in the mid-20th century?

The Presidential addresses and Supreme Court rulings begin to change the lives of the American people beginning in the mid-20th century through a series of debate. However, the Brown versus Board of Education prevented the segregation of schools and that every person living in the America whether black or white must have equal rights. 

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

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