Answer:
Push-pull theory
Explanation:
Push-pull theory is important to study because it determines the reason to leave a place or attracted immigrants from other places in search of better economic opportunities, social security, etc. The push factors are those which force a population to leave their country and migrate to another place. Pull factors are those which give reason to the population from other countries settle in the foreign country for various reasons.
<span>His work became the basis for algebra. is the answer</span>
Answer: Ulysses S. Grant
Explanation: Ulysses S. Grant was the 18th U.S. president. He was born in 1822 in Ohio and started to worked in his father's tannery at a young age.
In 1868 Ulysses was elected U.S. president. As president, he worked to protect rights of American Indians and African-Americans. He also tried to help the hurting economy.
