3. Which of the following correctly describes an effect railroads had on cities? 1 point
A. Cities became more isolated since they were located farther away from each other.
B. Cities grew as trains brought new residents and raw materials for industry and
construction

B. Cities grew as trains brought new residents and raw materials for industry and construction

gold discovery in california, and pioneer settlers were sometimes pulled west because they wanted to make a better living. others received letters from friends or family members who had moved west. these letters often told about a good life on the frontier. the biggest factor that pulled pioneers west was the opportunity to buy land.

welcome mark brainliest i am trying to get to the next level.

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;