<span>The Columbian Exchange and Atlantic slave trade were the two events most directly responsible for major population migrations in the 1700s.</span>
Oleg defeated the Khazars, delivering several Slavic tribes from dependence upon them, and also undertook a successful expedition against Constantinople (907), forcing the Byzantine government to sue for peace and pay a large indemnity.
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Cesar Chavez was an American labor leader and civil rights activist. Along with Dolores Huerta, he co-founded the National Farm Workers Association, which later merged with the Agricultural Workers Organizing Committee to become the United Farm Workers labor union. The organization he founded in 1962 grew into the United Farm Workers union, negotiated hundreds of contracts and spearheaded a landmark law that made California farmworkers the only ones in the nation entitled to protected union activity. In his most enduring legacy, Chavez gave people a sense of their own power.
Answer:
a city that with its surrounding territory forms an independent state!
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