By the end of 1920s, consumers buying and the economy began to slow down

Is there a question? Although, I went ahead and wrote this here for you.

Buying started declining towards the end of the 1920's. The factories had to cut back when stores that had huge amounts of goods stopped ordering from factories. Even before the stock market crashed, large amounts of factory workers were laid off. When the recession arrives at last, even more people are risking their work and wealth.

The first answer is stopped and the second is falling farm incomes

Explanation:

on edge

these civilizations were located around fertile rivers, where they could produce an abundance of crops