Which of the following is the best example of an intervening opportunity that influenced migration? a. many african american citizens were heading to chicago after the civil war, but settled in border cities just north of the deep south. b. americans from the south and the east migrated to california in search of gold in the late 1800s. c. some us citizens migrated to canada to avoid the draft during the vietnam war. d. many oil workers migrated from texas to wyoming when oil was discovered near evanston.

The correct answer is B.  Americans from the South and the East migrated to California in search of gold in the late 1800s.

Explanation

An intervention opportunity is a term used to refer to the potential of an area or region to exploit itself economically or to take advantage of it in some way. In general, places that have an opportunity to intervene have never been intervened by humans and therefore they keep high amounts of resources such as minerals, tourist potential, good weather, among other characteristics.

The gold rush is the name that received a massive migration between the years 1847 and 1855, which took place in San Francisco California, a state of the United States of America. The gold rush started very close to the town of Coloma, with the discovery of this metal at Sutter's Mill. The first gold diggers, named forty-niners, came to California by land and sea from the south and east. A social effect of the gold rush was the growth of San Francisco, which was a small village and with the passage of time and the arrival of immigrants, schools, churches, houses, roads, railways, among others, were built. So, the correct answer is B.  Americans from the South and the East migrated to California in search of gold in the late 1800s.