Agriculture and animal husbandry.
The people could now live in one place. The rich and fertile land and rivers produced a surplus of food and water.
Hope this helps! :)
I dont get what you are trying to ask here
Answer:
a. party realignment.
Explanation:
Party realignment refers to the rapid shift of political power among different political parties in a region. It happened in the case of Texas where the majority of voters change their political alliance from democrats to the republicans. And the reason for his was noted in history with the enactment of the Civil Rights Act of 1964 due to which conservative white democrats choose the Republican party.