The answer would be sound waves.
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The end of the World War II ha d a huge effect on the Pacific Rim states. The effect was mostly positive. This can be seen in the rapid industrialization of these nations, which resulted in rapid economic growth. Instead of war, these nations became focused on developing, economically and socially. Lot of things from the Western culture were introduced and adopted in order to become more competitive, to modernize, and have the same pace of cultural development as the other strong nations.
Lot of reforms were introduced, were the societies got democracy, the human rights improved significantly, the women became equal to the men and had the same opportunities in life.
All of this things led to a very quick change in the societies of this nations. The mentality changed, the way the governments and the people in general functioned changed. The economy changed and became strong and open towards the world.
A: because blacks, even though being free, were still treated like slaves and some were even put into sharecropping to ensure they stayed poor
The Bonus Army consisted of almost 43,000 marchers and about 17,000 veterans and their families who gathered in Washington in 1932. They had been awarded bonsuses in the form of certificates in 1924, which could not be redeemed until 1945. The Great Depression caused massive unemployment and veterans demanded immediate cash payment of the bonus. The marchers were dispersed by Douglass MacArthur.