The correct answer is "The California Gold Rush brought in people from all over the world, which resulted in cultural diffusion among the settlers there". The California Gold Rush started in 1848 when James W. Marshall found gold at Sutter's Mill, news that attracted 300,000 people to California from around the United States and abroad. This period of the early West is considered a crossroad of culture because people from distant cities and countries interacted with the aim to found gold.
