The correct answer is A.
The expression birds of passage was used to refer to temporary migrants, who moved to obtain those job positions which are considered of low-quality by native-born workers. The term was used at first in the 1840s, to refer to British inmigrants and continued to be used along the 20th century with the arrivals of European, Asian or Latin American migrants.
Answer:
The building of a postal system helped to increase the economy.
Despite winning the popular vote, Al Gore lost the election in 2000.
