Bringing water in from different areas can cause diseases and medical problems. Unfamiliar minerals and vitamins, along with diseases and bacteria, can manifest the water. People or animals whom have not adapted to the water's different diseases and bacteria can catch these diseases and get sick from the bacteria. Natives, on the other hand, may have adapted to the water's bacteria, and the body changes in order to fight off the different bacterium.
Answer: D. construction and protection of roads that ensured safe and easy travel
Explanation:
Under Genghis Khan and his descendants, the Mongols conquered much of Asia and some of Eastern Europe such that they created the largest land empire ever seen.
Even though these Mongols could be brutal in conquest, they increased trade in the region by repairing the networks of roads that connected their conquered areas as well as constructing more. The protection they afforded these roads was renowned thus making travel easy.
True, the Tejas blamed the Spaniards for an outbreak of deadly disease. The Spanish started to colonize there bring diseases over with them, and as Indians gave them land they gave new and unknown elements to the land like the pilgrims did.
At the beginning of the 1960s, many Americans believed they were standing at the dawn of a golden age. On January 20, 1961, the handsome and charismatic John F. Kennedy became president of the United States. His confidence that, as one historian put it, “the government possessed big answers to big problems” seemed to set the tone for the rest of the decade. However, that golden age never materialized. On the contrary, by the end of the 1960s it seemed that the nation was falling apart. In the 60s there was a defining civil war. Not all Americans where on favour of the war because not all agreed. Unfortunately, the War on Poverty was expensive–too expensive, especially as the war in Vietnam became the government’s top priority. There was simply not enough money to pay for the War on Poverty and the war in Vietnam. Conflict in Southeast Asia had been going on since the 1950s, and President Johnson had inherited a substantial American commitment to anti-communist South Vietnam. Soon after he took office, he escalated that commitment into a full-scale war. In 1964, Congress authorized the president to take “all necessary measures” to protect American soldiers and their allies from the communist Viet Cong. Within days, the draft began.
The war dragged on, and it divided the nation. Some young people took to the streets in protest, while others fled to Canada to avoid the draft. Meanwhile, many of their parents and peers formed a “silent majority” in support of the war.
