This question has two parts.

Explain how the Supreme Court cases Plessy v Ferguson and Brown v Board of Education are related. Explain the effect(s) these cases had on US citizens.

Plessy v Ferguson and Brown v Board of Education are two landmark Supreme Court cases that are related in their focus on racial segregation and their impact on the legal framework of the United States.

Plessy v Ferguson (1896) was a case that dealt with racial segregation in public facilities, specifically with train cars. The Supreme Court's ruling in this case established the legal principle of "separate but equal," which allowed for racial segregation as long as the separate facilities provided were deemed equal in quality. This ruling upheld racial segregation laws and had a significant impact on African American citizens, perpetuating discrimination and reinforcing the notion of racial inequality.

Brown v Board of Education (1954) was a case that challenged racial segregation in public schools. In this case, the Supreme Court overturned the "separate but equal" doctrine established in Plessy v Ferguson, ruling that racial segregation in public schools was inherently unconstitutional. The court declared that public education must be integrated, stating that the segregation of schools resulted in unequal educational opportunities and violated the 14th Amendment's guarantee of equal protection under the law.

The effect of these cases on US citizens was profound. Plessy v Ferguson had a negative impact on African Americans, as it legitimized racial segregation and allowed for continued discrimination and unequal treatment. It further entrenched the belief in white supremacy and contributed to the systemic oppression of African Americans.

In contrast, Brown v Board of Education marked a significant turning point in the fight against racial segregation. The ruling in this case dismantled the legal framework of segregation in public schools and set a precedent for desegregation efforts in other areas of society. It was a crucial step toward achieving equality and justice for African Americans and other marginalized groups. However, it's important to note that Brown v Board of Education did not immediately lead to complete racial integration in schools or eliminate racial prejudice. The process of desegregation was met with resistance and faced challenges throughout the following years.

Understanding the impact and significance of these cases requires a deeper exploration of the social, political, and cultural context in which they occurred. Historical analysis and studying primary and secondary sources, such as Supreme Court opinions, commentary, and scholarly articles, can provide a more comprehensive understanding of these cases and their effects on US citizens.