Answer:
1. c- Members of the lower class packed into tenement housing
2. D- The sizes of families began to decrease.
3. F- Land prices declined as the land was polluted
Explanation:
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I believe that countries such as France and China have instituted language controls in order to protect their national language and heritage.
Even today, a French person will rarely speak to you in any language other than French, even if you don't understand them.
The number one thing was the ending of Wold War I. The war was immensely destructive, taking over 38 million lives. Once the war had ended in 1919 with America and the Allied Powers victorious, there was of course reason to celebrate. After this, economic trading was drastically increasing, there was a legendarily massive stock market boom, and all of society seemed to be heavily prospering.