Answer:
President Theodore Roosevelt oversaw the realization of a long-term United States goal—a trans-isthmian canal. Throughout the 1800s, American and British leaders and businessmen wanted to ship goods quickly and cheaply between the Atlantic and Pacific coasts.
Explanation:
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Local boards or local boards of health were local authorities in urban areas of England and Wales from 1848 to 1894. They were formed in response to cholera epidemics and were given powers to control sewers, clean the streets, regulate environmental health risks including slaughterhouses and ensure the proper supply of water to their districts. Local boards were eventually merged with the corporations of municipal boroughs in 1873, or became urban districts in 1894.
because of rats. those areas were more populated with rats than most areas. rats carried the sickness around.