Answer:
The rise of communism in any country was a danger to it's neighbors.
Explanation:
Domino theory has been highly influential in US foreign policy. The war in Vietnam is a perfect example.
New immigrants - coming from poland italy russia ( southern and eastern europe)
It could keep people from living there lives
Use of ground troops: Americanization used US ground troops to fight the war whereas Vietnamization used S.Vietnamese ground troops to fight the war.
Johnson moved the US from an aid and financial backer to a ground force with men in active duty on the front lines in addition to naval and air support. Nixon's policy removed the ground troops, leaving the S. Vietnamese to fight that on their own (with our aid and money) but continued our air strikes and naval support.
Answer:
Benefit: The Romans introduced the sakia 2,300 years ago and they are still used today to raise water from underground wells. Some farmers now use electrical pumps to take water from the Nile onto farmland. Crops grown along the Nile and fish caught in the river provide food for the people of Egypt.
Threat: Despite its importance, the Nile is still heavily polluted in Egypt by waste water and rubbish poured directly into it, as well as agricultural runoff and industrial waste, with consequences for biodiversity, especially fishing and human health.