Assertion: The 1960s were labelled as the 'dangerous decade'.
Reason: The unresolved problems like poverty, inequality, communal and regional divisions, etc. could lead to a failure of the democratic project or even the disintegration of the country

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

Furthermore, there lingered doubts regarding the ability of the forthcoming leadership to adeptly address the array of looming challenges that awaited solutions. The 1960s acquired the moniker of the 'dangerous decade' due to the presence of unresolved issues such as poverty, inequality, communal tensions, and regional divisions, among others. These concerns loomed large, potentially jeopardizing the trajectory of the democratic endeavour or even the unity of the nation itself.