Answer: As a result of the invasions, and a weak central government, a new social and political system known as feudalism developed. Strong local lords formed a strict code of behavior and allegiances which became the foundation of feudal life.
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During the 1920s, the "negro nationalism" developed as a way to create a new identity for Black Americans. The effects of both slavery and discrimination (for example, with Jim Crow laws) made many people believe that Africans Americans could not possibly integrate into mainstream White American culture. It also made African Americans more reluctant to deny or forget their past. Therefore, many black artists focused on creating an identity that was still American, but also of black legacy. This was reflected in the art and politics of the Harlem Renaissance.
Astronomers can use the color of an object in space to determine its temperature. Stars are similar to blackbodies, and that the color variation of stars is a direct consequence of their surface temperatures.To estimate the surface temperature of a star,the relationship between the temperature of a blackbody, and the wavelength of light where its spectrum peaks is used.