What are the challenges the economy face from skilled migrants?

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Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Examples are the following: 1. 1996: rash of church thefts include one to finance trips to cape cod.-on this day in 1996, a lutheran treasurer in cheshire, connecticut was accused of  stealing from his church to finance a lifestyle that included resort trips and vacation homes on cape cod and in vermont.2. the story in the new york  times began: -lutheran treasurer in connecticut accused of stealing from churcha former treasurer of the lutheran churches governing body in new england was arrested yesterday on charges that he embezzled $800,000 from the church to finance a life style that included resort trips and vacation homes on cape cod and in vermont.