What was significant about President Reagan’s appointment of Sandra Day O’Connor to the Supreme Court?

Sandra Day O'Connor was nominated to the Supreme Court by President Reagan on August 19, 1981, thus fulfilling his 1980 campaign promise to appoint the first woman to the highest court in the United States. ... As a moderate, she often provided the deciding vote on many of the court's cases.

Explanation:

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity

answer; taking up arms to defend the nation;