During which presidency did polarization regarding diversity reach its highest gaps according to the content?

The answer indicating that polarization regarding diversity reached its highest gaps during Obama's presidency is supported by significant socio-political factors and events that characterized his time in office. President Obama’s administration was marked by a heightened discussion around diversity, racial equality, and policies aimed at promoting inclusivity such as healthcare reform, immigration policy changes, and discussions around systemic racism.

During this period, the nation experienced notable instances of polarization, particularly as Obama's election as the first African American president served as a catalyst for both support and backlash regarding issues of race and diversity. Many Americans embraced his presidency as a step forward in terms of racial progress, while others reacted with opposition, reflecting deep-seated divisions on these matters.

Additionally, factors such as the rise of the Tea Party movement and the significant political discourse surrounding diversity initiatives added to the polarization. In analyzing the context of the other presidencies, while they each had their share of discussions around diversity, the intensity and polarization witnessed during Obama's time were particularly pronounced, as societal debates intensified on these issues, revealing stark contrasts in views across different demographics and political affiliations. This context showcases why the correct answer centers on Obama's presidency as a pivotal moment in the discourse on diversity and polarization.