What historical era marked the decline of floodplain civilizations and the introduction of civilizations that would become the foundations for many modern cultures?

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .

When analyzing the american landscape at the time, it can be clear that some women did not support the suffrage movement due to the fact that it would impact their current way of life, leading to fewer protections and safeguarding under the us law, and in their family lives.