Answer:
no one knows for sure but most think it was caused by WW2. When WWII started the USA started sending supplies to the allied powers and making the economy boom. When the USA entered the war millions of men where sent to the UK and all the jobs and factories where filled and pumping out supplies and resources at full swing.
World War 1.
Many blacks left southern states during WW1 and moved to big northern cities to work in war industries.
More went to New York city than to any other,and after the war there a lot of blacks living in Harlem who were literate and artistic.
Explanation:
Por qué las primeras grandes civilizaciones requirieron de gobiernos centralizados y autoritarios? Las primeras grandes civilizaciones requirieron de gobiernos centralizados y autoritarios para poder ejercer su férreo control sobre su territorio, como por ejemplo sucedió en Egipto.
